Q1.
Antarctica is a huge land mass surrounding the Earth’s south pole. It is covered in a very
thick layer of ice and is the only remaining large area of the Earth’s surface that has not been
affected very much by humans.
There are, however, teams of scientists from various countries studying Antarctica. These
scientists need electricity for lighting, for their computers and other scientific instruments and to
communicate, via satellite, with the rest of the world. The temperature in Antarctica is always
sub-zero, so the scientists need some way of keeping their buildings warm. They also need fuel
to be able to get around on their snowmobiles.
Scientists cannot avoid affecting the environment. However, they want to affect it as little
as possible.
Atmospheric pollution produced in one country eventually affects the whole of the Earth’s
atmosphere. The hole that appears each year in the ozone layer above Antarctica, for example,
is mainly caused by pollutants such as CFCs from countries in the northern half of the Earth.
Page 1 of 72
Discuss the advantages and disadvantages of using the following energy sources to meet the
scientists’ needs:
•
solar energy
•
energy from the wind
•
natural gas (present in large quantities deep down in the Antarctic land mass)
•
diesel oil (which would have to be imported)
...............................................................................................................................................
...............................................................................................................................................
...............................................................................................................................................
...............................................................................................................................................
...............................................................................................................................................
...............................................................................................................................................
...............................................................................................................................................
...............................................................................................................................................
...............................................................................................................................................
...............................................................................................................................................
...............................................................................................................................................
(Total 10 marks)
Q2.
The diagram shows what happens to each 100 joules of energy from the coal which is
burned in a power station when the electricity is used for lighting.
(3)
(a)
Add the missing figures to the diagram.
Page 2 of 72
(b)
By spending the same amount of money the electricity company could install new power
lines which only waste half as much energy as the old ones;
or use a quarter of the heat wasted at the power station to heat schools in a nearby town.
or replace all the light bulbs in everyone’s homes with bulbs which produce the same
amount of light but use only a fifth as much electricity.
(About 10% of the electricity in homes is used for lighting.)
Which of these two things do you think they should do? Give a reason for your answer.
....................................................................................................................................
....................................................................................................................................
....................................................................................................................................
....................................................................................................................................
....................................................................................................................................
(4)
(c)
You can work out the efficiency of an energy transfer system like this:
(i)
How efficient are ordinary light bulbs at transferring electrical energy as light?
..........................................................................................................................
..........................................................................................................................
(1)
(ii)
How efficient is the complete system at transferring the energy from coal as light
when ordinary light bulbs are used?
..........................................................................................................................
..........................................................................................................................
(1)
(Total 9 marks)
Page 3 of 72
Q3.
The diagram shows what happens to each 100 joules (J) of energy from the coal which is
burned in a power station.
(a)
Put the missing figures in the spaces on the diagram.
(2)
(b)
By spending the same amount of money the electricity company could:
either install new power lines which only waste half as much energy as the
old ones;
or use a quarter of the heat wasted at the power station to heat schools in a
nearby town.
Which of these two things do you think they should do? Give a reason for your answer.
....................................................................................................................................
....................................................................................................................................
(2)
(Total 4 marks)
Page 4 of 72
Q4.
(a)
The pie-chart shows how energy is used in a home.
Complete the table using the information on the pie-chart.
(2)
(b)
We get some of the energy we need in our homes from electricity.
The graphs show how the amounts of coal and gas used to generate electricity changed
between 1960 and 1990.
Describe these changes.
Coal ............................................................................................................................
.....................................................................................................................................
.....................................................................................................................................
Gas ..............................................................................................................................
.....................................................................................................................................
.....................................................................................................................................
(4)
(c)
Read the information below.
•
More carbon dioxide in the air may change the weather. Farmers may then not be
able to produce the food we need.
•
Burning coal produces sulphur dioxide. Burning gas does not do this.
•
It is cheaper to generate electricity from gas than from coal.
Page 5 of 72
•
Sulphur dioxide causes acid rain which can kill fish and damage
buildings.
•
Two power stations generate the same amount of electricity. The
one which burns gas produces less carbon dioxide than the other
which burns coal.
Many people say that the change from coal to gas is better for the environment.
Why do you think they say this?
.....................................................................................................................................
.....................................................................................................................................
.....................................................................................................................................
.....................................................................................................................................
(3)
(Total 9 marks)
Q5.
On a very windy hilltop there are two wind generators side by side.
The bar charts show the lengths of the turbine blades and the electrical outputs of the two
wind generators.
Page 6 of 72
Complete the following table.
LENGTH OF TURBINE
BLADE (m)
Large wind generator
ELECTRICAL OUTPUT
(MW)
60
Small wind generator
(Total 3 marks)
Q6.
The table shows the main sources of the energy used in Britain in 1990.
(a)
coal
35%
oil
35%
gas
24%
nuclear
5%
moving water
(hydro)
1%
Finish the pie-chart, using the figures in the table.
(3)
(b)
How does the amount of energy obtained from nuclear sources in 1990 compare with the
amount obtained from moving water?
.....................................................................................................................................
.....................................................................................................................................
(1)
Page 7 of 72
(c)
Moving water (hydro) is a renewable energy source.
Write down the name of one other renewable energy source.
.....................................................................................................................................
(1)
(d)
Explain why electricity is not included in the table of energy sources.
.....................................................................................................................................
.....................................................................................................................................
(1)
(Total 6 marks)
Q7.
The table shows the main sources of energy used in Britain in 1990.
(a)
coal
35%
oil
35%
gas
24%
nuclear
5%
moving water
(hydro)
1%
Finish the pie-chart, using the figures in the table.
(4)
(b)
Complete the following sentences.
To release energy from coal, gas and oil they must be burned.
Coal, gas and oil are all .............................................................
(1)
Page 8 of 72
(c)
Which one of the energy sources in the table is renewable? ......................................
Write down the name of one other renewable energy source. ....................................
(2)
(d)
How does the amount of energy obtained from nuclear sources in 1990 compare with the
amount obtained from moving water?
.....................................................................................................................................
.....................................................................................................................................
(2)
(Total 9 marks)
Page 9 of 72
Q8.
Electricity may be produced from a number of different energy resources.
(i)
Complete the table below.
The first one has been done for you.
Device
Energy
resource
Useful energy transfer
from resource
Coal-fired power station
Coal
Chemical
electrical
Hydroelectric power station
Stored
water
....................
electrical
Sun
....................
electrical
Wind
....................
electrical
Gas
....................
electrical
Solar cell in calculator
Wind turbine
Gas-fired power station
(4)
Page 10 of 72
(ii)
Give one of the five energy resources opposite, which is not classified as renewable.
....................................................................................................................................
(1)
(iii)
State another non-renewable energy resource.
....................................................................................................................................
(1)
(Total 6 marks)
Q9.
The drawing shows a hydro-electric dam. Water from the top of the dam flows through pipes
to the power station at the bottom of the dam.
(a)
Complete the following boxes to show the useful energy transfer which occurs as the
water flows through the pipes to the power station.
(2)
Page 11 of 72
(b)
The electricity generated by the power station is transmitted over long distances. Before
this happens its voltage is increased by using a step-up transformer.
State and explain one advantage and one disadvantage of transmitting electricity at high
voltage.
Advantage .................................................................................................................
....................................................................................................................................
....................................................................................................................................
....................................................................................................................................
(2)
Disadvantage ............................................................................................................
....................................................................................................................................
....................................................................................................................................
....................................................................................................................................
(2)
(Total 6 marks)
Q10.
The bar chart shows the relative costs of some different energy sources that are used to
generate electricity.
Page 12 of 72
(a)
Apart from cost, give two advantages that a hydroelectric power station has compared
with a wind farm.
1 ..................................................................................................................................
.....................................................................................................................................
2 ..................................................................................................................................
.....................................................................................................................................
(2)
(b)
Apart from cost, give one advantage and one disadvantage that a nuclear power station
has compared with a coal-fired power station.
Advantage ...................................................................................................................
.....................................................................................................................................
Disadvantage ..............................................................................................................
.....................................................................................................................................
(2)
(c)
State and explain one situation where it is better to use solar energy, rather than any of the
other energy sources, to generate electricity.
.....................................................................................................................................
.....................................................................................................................................
.....................................................................................................................................
.....................................................................................................................................
(2)
(Total 6 marks)
Q11.
The table shows the main sources of energy used to generate electricity.
Energy source
Percentage (%)
coal
35
hydroelectric
5
natural gas
25
nuclear
oil
(a)
15
Complete the table by writing in the percentage for nuclear power.
(1)
Page 13 of 72
(b)
Use the information from the table to complete and label the pie chart below.
(2)
(c)
Why can hydroelectric generators be used to meet sudden increases in the demand for
electricity?
.....................................................................................................................................
(1)
(d)
Gases are released when fossil fuels burn.
(i)
Which one of these gases increases the greenhouse effect?
...........................................................................................................................
(1)
(ii)
Which one of these gases produces acid rain?
...........................................................................................................................
(1)
(Total 6 marks)
Q12.
Different energy sources are shown in the box.
An ‘Eco-home’ is one which is friendly to the environment.
Imagine you are designing an ‘Eco-home’ which can use any of the energy sources above to
generate electricity
Page 14 of 72
(a)
Choose one non-renewable energy source from the box above that could provide the
electricity supply to your ‘Eco-home’, but which would be unsuitable.
Write the energy source in the table and explain, as fully as you can, why it is unsuitable
for an ‘Eco-home’.
Non-renewable
energy source
Unsuitable for an ‘Eco-home’ because
.......................
.................................................................................................
.......................
.................................................................................................
.................................................................................................
.................................................................................................
.................................................................................................
.................................................................................................
.................................................................................................
.................................................................................................
(2)
Page 15 of 72
(b)
Choose two suitable renewable energy sources from the box opposite that could provide
an electricity supply to your ‘Eco-home’.
Write the two energy sources in the table and describe, in as much detail as you can, the
undesirable environmental effects of using these.
Renewable
energy source
1
Undesirable environmental effects
.................................................................................................
.......................
.................................................................................................
.......................
.................................................................................................
.................................................................................................
.................................................................................................
.................................................................................................
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2
.................................................................................................
.......................
.................................................................................................
.......................
.................................................................................................
.................................................................................................
.................................................................................................
.................................................................................................
.................................................................................................
(4)
(Total 6 marks)
Page 16 of 72
Q13.
Use of renewable sources of energy is expected to increase. The table shows the
comparative costs of producing I kWh of electricity from different energy sources.
Types of energy sources
used
in the UK
Fossil fuels (non-renewable)
Cost of producing 1 kWh of
electrical energy
Coal
1.0 p
Gas
1.4 p
Oil
1.5 p
Nuclear fuels (non-renewable)
Nuclear
0.9 p
Renewable
Hydroelectric
0.2 p
Wind
0.9 p
Installation and decommissioning costs are not included
At present about 2% of electricity generated in the UK uses renewable energy sources. Consider
the three types of energy sources in the table and give one advantage and one disadvantage for
each (other than installation and decommissioning costs).
Advantage
Disadvantage
Using fossil fuels
Using fossil fuels
.............................................................................
.............................................................................
.............................................................................
.............................................................................
.............................................................................
.............................................................................
Using nuclear fuels
Using nuclear fuels
.............................................................................
.............................................................................
.............................................................................
.............................................................................
.............................................................................
.............................................................................
Using renewable sources
Using renewable sources
.............................................................................
.............................................................................
.............................................................................
.............................................................................
.............................................................................
.............................................................................
(Total 6 marks)
Page 17 of 72
Q14.
Electricity is a useful form of energy.
(a)
Different energy sources can be used to generate electricity.
Give one advantage and one disadvantage (other than cost) of using each energy source
to generate electricity in the UK.
Advantage
Disadvantage
Using wind
Using wind
...........................................................
...........................................................
...........................................................
...........................................................
...........................................................
...........................................................
Using coal
Using coal
...........................................................
...........................................................
...........................................................
...........................................................
...........................................................
...........................................................
(4)
Page 18 of 72
(b)
List A shows three electrical devices.
List B gives the type of useful energy transferred.
Draw a straight line from each electrical device in List A to the useful energy it transfers in
List B.
(2)
(Total 6 marks)
Page 19 of 72
Q15.
State and explain the advantages and disadvantages of using nuclear power stations to
produce electricity.
...............................................................................................................................................
...............................................................................................................................................
...............................................................................................................................................
...............................................................................................................................................
...............................................................................................................................................
...............................................................................................................................................
...............................................................................................................................................
...............................................................................................................................................
(Total 4 marks)
Q16.
The map below shows the position of two towns, A and B, on the banks of a large river
estuary.
A is an important fishing and ferry port.
The wind usually blows from the west. The major roads and railways are shown.
A power station is to be built in area X to generate electricity for the region.
The choice is between a nuclear power station and a coal fired power station.
Page 20 of 72
(a)
State the advantages and disadvantages of the two methods of generating
electrical energy.
....................................................................................................................................
....................................................................................................................................
....................................................................................................................................
....................................................................................................................................
....................................................................................................................................
....................................................................................................................................
....................................................................................................................................
....................................................................................................................................
....................................................................................................................................
....................................................................................................................................
....................................................................................................................................
....................................................................................................................................
(6)
(b)
Which method would you choose for this site?
....................................................................................................................................
Explain the reason for your choice.
....................................................................................................................................
....................................................................................................................................
....................................................................................................................................
....................................................................................................................................
....................................................................................................................................
....................................................................................................................................
(3)
(Total 9 marks)
Q17.
The diagram below shows four stages in the production of electricity by a coal-fired power
station.
Page 21 of 72
(a)
(i)
Write down two environmental problems which are caused by burning coal to
generate electricity.
1 ......................................................................................................................
..........................................................................................................................
..........................................................................................................................
2 ......................................................................................................................
..........................................................................................................................
..........................................................................................................................
(ii)
How may these environmental problems be reduced?
1 ......................................................................................................................
..........................................................................................................................
..........................................................................................................................
2 ......................................................................................................................
..........................................................................................................................
..........................................................................................................................
(4)
(b)
Some data for Didcot coal-fired power station is given below.
Number of generators
Maximum continuous power rating of a generator
Energy content of coal used
Total quantity of coal used each day
4
500 MW at 23 500 V
2.66 × 1010 J per tonne
18 289 tonnes
Use the given data to calculate:
(i)
the total electrical energy output each day.
...........................................................................................................................
...........................................................................................................................
...........................................................................................................................
Answer ................................................J/day
(ii)
the total input of coal energy each day.
...........................................................................................................................
...........................................................................................................................
...........................................................................................................................
Answer ................................................J/day
Page 22 of 72
(iii)
the efficiency of the power station.
...........................................................................................................................
...........................................................................................................................
...........................................................................................................................
Answer ................................................ %
(8)
(c)
Energy is conserved.
(i)
Choose one of the stages in the diagram at the start of the question.
State what happens to the wasted energy during this stage.
...........................................................................................................................
...........................................................................................................................
...........................................................................................................................
(ii)
Explain what happens to all wasted energy during energy transfers.
...........................................................................................................................
...........................................................................................................................
...........................................................................................................................
(3)
(Total 15 marks)
Q18.
Transformer A produces a very high voltage to transmit the electrical energy through the
National Grid.
Explain why electrical energy is transmitted at a very high voltage.
...............................................................................................................................................
...............................................................................................................................................
...............................................................................................................................................
(Total 3 marks)
Page 23 of 72
Q19.
Describe, in as much detail as you can, how the energy stored in coal is transferred into
electrical energy in a power station.
...............................................................................................................................................
...............................................................................................................................................
...............................................................................................................................................
...............................................................................................................................................
...............................................................................................................................................
...............................................................................................................................................
...............................................................................................................................................
...............................................................................................................................................
...............................................................................................................................................
(Total 5 marks)
Q20.
The outline diagram below shows a tidal power generating system.
Gates in the barrage are open when the tide is coming in and the basin is filling to the high tide
level. The gates are then closed as the tide begins to fall.
Once the tide outside the barrage has dropped the water can flow through large turbines in the
barrage which drive generators to produce electrical energy.
In one second 1.2 × 109 kg of water flows through the turbines at a speed of 20 m/s.
Page 24 of 72
(a)
When used with a water speed of 20 m/s the system has an efficiency of 90% in
converting the kinetic energy of the water into electrical energy. Calculate the power output
of the generators.
....................................................................................................................................
....................................................................................................................................
....................................................................................................................................
(2)
(b)
The power output of a coal fired power station is 1000 MW (1 x 109 W).
(i)
Suggest two advantages of coal fired power stations over tidal power
generating systems.
1. .....................................................................................................................
..........................................................................................................................
2. .....................................................................................................................
..........................................................................................................................
(ii)
Suggest two advantages of tidal power generating systems over coal fired
power stations.
1. .....................................................................................................................
..........................................................................................................................
2. .....................................................................................................................
..........................................................................................................................
(iii)
Suggest and explain one disadvantage of a tidal power generating system.
..........................................................................................................................
..........................................................................................................................
..........................................................................................................................
..........................................................................................................................
(6)
(Total 8 marks)
Page 25 of 72
Q21.
The map below shows an industrial region (shaded).
The prevailing wind is from the west. There is a nearby mountainous area, from which a river
flows through the region. The major road and rail links are shown.
A power station is to be built to supply electrical energy to the region. The energy will be for a
range of domestic and industrial uses.
The choice is between a coal fired power station, wind turbines and a hydroelectric scheme.
Three local groups each support a different option. Choose which option you would support and
justify your choice by making reference to the financial, social and environmental implications of
your choice compared with those of the alternative systems.
(Total 8 marks)
Q22.
The outline diagram below shows part of the National Grid. At X the transformer increases
the voltage to a very high value. At Y the voltage is reduced to 240 V for use by consumers.
Page 26 of 72
(i)
At X a transformer increases the voltage. What happens to the current as the voltage is
increased?
.....................................................................................................................................
(1)
(ii)
Why is electrical energy transmitted at very high voltages?
.....................................................................................................................................
.....................................................................................................................................
(1)
(iii)
The transformer at Y reduces the voltage before it is supplied to houses. Why is this
done?
.....................................................................................................................................
.....................................................................................................................................
(1)
(Total 3 marks)
Q23.
(a)
Coal, gas, oil and wood are all examples of fuels.
(i)
What are fuels?
...........................................................................................................................
(1)
(ii)
Write the names of these fuels in the table below to show which are renewable and
which are non-renewable.
(2)
Page 27 of 72
(b)
The list below shows energy resources which are not fuels.
geothermal
nuclear
solar
tides
wind
Write the names of the energy resources in the table below to show which are renewable
and which are non-renewable.
(2)
(c)
Why is it better to use more renewable energy resources rather than
non-renewable resources?
.....................................................................................................................................
.....................................................................................................................................
.....................................................................................................................................
.....................................................................................................................................
(2)
(Total 7 marks)
Page 28 of 72
Q24.
In a traditional power station 30% of the energy input is usefully transferred to electricity, the
rest is wasted as heat. The diagram shows the energy transfers in a combined heat and power
(CHP) station.
Explain why replacing traditional power stations by CHP stations may be beneficial to the
environment.
...............................................................................................................................................
...............................................................................................................................................
...............................................................................................................................................
...............................................................................................................................................
(Total 2 marks)
Q25.
(a)
Electricity can be generated using different energy resources.
(i)
Draw lines to link each way of producing electricity to a statement about an energy
resource.
(4)
Page 29 of 72
(ii)
Which one of these methods of producing electricity uses a non-renewable energy
resource?
..........................................................................................................................
(1)
(b)
The wind is a renewable energy resource.
(i)
One of the following statements describes the source of energy that creates a wind.
Tick the box next to the correct statement.
The Earth turning on its axis.
The gravity pull of the Moon.
Heat from the Sun.
(1)
(ii)
Complete the sentence by choosing the correct word from the box.
heat
kinetic
sound
A wind turbine transfers ..................................... energy to electrical energy.
(1)
(iii)
A wind turbine does not produce electricity all of the time. Why not?
..........................................................................................................................
(1)
(Total 8 marks)
Q26.
(a)
(i)
A student wrote "Coal traps energy from the Sun". Explain what the student
means.
..........................................................................................................................
..........................................................................................................................
..........................................................................................................................
(2)
(ii)
How is energy released from coal?
..........................................................................................................................
..........................................................................................................................
(1)
Page 30 of 72
(b)
The diagram shows the waste products from a coal-fired power station.
(i)
In what form does the power station waste energy?
..........................................................................................................................
(1)
(ii)
Carbon dioxide released into the atmosphere will lead to a rise in the Earth’s
temperature. Why?
..........................................................................................................................
..........................................................................................................................
(1)
(Total 5 marks)
Q27.
(a) A swimming pool has a wave making machine. The diagram shows the water wave
pattern for 3 seconds.
(i)
How many water waves are shown in the diagram?
..........................................................................................................................
(1)
(ii)
What is the frequency of the water waves?
..........................................................................................................................
(1)
Page 31 of 72
(iii)
Which one of the units below is used to measure frequency? Underline your
answer.
hertz
joule
watt
(1)
(b)
The diagram shows the direction of the waves across the pool. The waves reflect off the
side of the pool.
Draw a line on the diagram to show the direction of the waves after they hit the side of the
pool.
(1)
(c)
The swimming pool is used to test a model of an electricity generator. The waves make
the floating generator move up and down. This energy is transferred to electricity.
(i)
In the following sentence, cross out the two lines that are wrong in the box.
The diagram shoes that the amplitude of the waves
pass the generator.
as the waves
(1)
(ii)
What type of energy does the generator transfer to electricity?
..........................................................................................................................
(1)
(iii)
Energy from ocean waves could be used to generate electricity. Would this be a
renewable or non-renewable energy resource?
..........................................................................................................................
(1)
(Total 7 marks)
Page 32 of 72
Q28.
(a)
Most electricity in Britain is generated by coal fired power stations.
Complete the sequence of useful energy transfers which take place in the power station.
(1)
(b)
The diagram shows a wind turbine which is used to produce electricity using energy from
the wind.
(i)
What is the source of energy which creates winds?
...........................................................................................................................
(1)
(ii)
Explain the advantage of using a wind turbine to produce electricity.
...........................................................................................................................
...........................................................................................................................
...........................................................................................................................
(2)
(Total 4 marks)
Page 33 of 72
Q29.
(a)
Explain how energy is produced in the Sun.
..................................................................................................................................
..................................................................................................................................
..................................................................................................................................
..................................................................................................................................
(3)
(b)
Read the following article that appeared in a magazine.
“Conservation of energy is important in today’s society. Energy sources, such as oil and
coal, which have been used for the development of an industrial society, cannot be relied
upon as heavily in the future. Renewable energy sources cannot provide such large
quantities of energy for society without causing problems.”
(i)
Give two reasons why oil should not be relied on as a major source of energy for the
future.
1 ......................................................................................................................
......................................................................................................................
2 ......................................................................................................................
......................................................................................................................
(2)
(ii)
Energy from the wind is a renewable energy resource. State three problems which
may arise if the wind were to be used to meet the energy requirements of a large
industrial city in Britain.
1 ......................................................................................................................
......................................................................................................................
......................................................................................................................
2 ......................................................................................................................
......................................................................................................................
......................................................................................................................
3 ......................................................................................................................
......................................................................................................................
......................................................................................................................
(3)
(Total 8 marks)
Page 34 of 72
Q30.
A castle is a long way from the nearest town. Batteries power the car park ticket machine.
Solar cells are used to keep the batteries charged.
(a)
Complete the following sentences by choosing the correct words from the box.
Each word may be used once or not at all.
chemical
(i)
electrical
heat
light
sound
The energy input to the solar cells is ................................................ energy.
(1)
(ii)
The useful energy output from the solar cells is ........................................ energy.
(1)
(b)
For every 500 J of energy absorbed by the solar cells, 75 J of energy are transferred to the
batteries.
Use the following equation to calculate the efficiency of the solar cells. Show clearly how
you work out your answer.
Efficiency =
.....................................................................................................................................
.....................................................................................................................................
Efficiency = ……………………………
(2)
Page 35 of 72
(c)
Which one of the following statements gives the main reason for using solar cells to
charge the batteries?
Tick ( ) the box next to your choice.
Solar cells give a constant supply of electricity.
A few solar cells can provide a large amount of electricity.
The ticket machine is a long way from other electricity supplies.
(1)
(d)
The graph shows how the cost of producing electricity using solar cells has changed.
Use the graph to predict the cost of one Unit of electricity in 2010.
.....................................................................................................................................
(1)
(Total 6 marks)
##
(a)
In Britain most power stations burn fuel to produce heat. The diagram shows the stages
by which the heat is transferred into electrical energy.
Complete the diagram by filling in the missing word.
Water heated to
produce steam
→
Steam turns
a turbine
→
Turbine turns a
coil in a
→
Electricity is
produced
..........................
(1)
Page 36 of 72
(b)
A fuel burning power station uses 2000 joules of fuel energy to generate 600 joules of
electrical energy. The rest of the fuel energy is wasted as heat.
(i)
For every 600 joules of electrical energy generated, how much fuel energy is wasted
as heat?
...........................................................................................................................
...........................................................................................................................
(1)
(ii)
Use the following equation to calculate the efficiency of the power station.
Show clearly how you work out your answer.
efficiency =
...........................................................................................................................
...........................................................................................................................
efficiency = ......................................................................
(2)
(c)
List A gives three energy resources used to generate electricity. List B gives
environmental problems that may be caused by using different energy resources. Draw a
straight line from each energy resource in List A to the environmental problem it may
cause in List B. Draw three lines only.
(3)
Page 37 of 72
(d)
A small wind generator is used to charge a battery. The graph shows the power output of
the generator at different wind speeds.
(i)
What is the maximum power produced by the generator?
................................................................................................................. watts
(1)
(ii)
The generator is designed to stop if the wind speed is too high.
At what wind speed does the generator stop working?
.................................................................................................................... m/s
(1)
(iii)
Give one disadvantage of using a wind generator to charge a battery.
...........................................................................................................................
...........................................................................................................................
(1)
(Total 10 marks)
Page 38 of 72
Q32.
(a) The bar chart shows the start-up time for different types of fuel-burning power
stations.
Which type of power station would be the quickest to start producing electricity?
.....................................................................................................................................
(1)
(b)
A fuel-burning power station is more reliable than a wind generator at producing electricity.
Explain why.
.....................................................................................................................................
.....................................................................................................................................
.....................................................................................................................................
.....................................................................................................................................
(2)
(c)
Fuel-burning power stations may produce air pollution. Why does a wind generator not
produce any air pollution?
.....................................................................................................................................
.....................................................................................................................................
(1)
(Total 4 marks)
Page 39 of 72
Q33.
The diagram shows how electricity is distributed from power stations to consumers.
(a)
(i)
What name is given to the network of cables and transformers that links power
stations to consumers?
...........................................................................................................................
(1)
(ii)
What does a step-up transformer do?
...........................................................................................................................
(1)
(iii)
Explain why step-up transformers are used in the electricity distribution system.
...........................................................................................................................
...........................................................................................................................
...........................................................................................................................
...........................................................................................................................
(2)
(b)
Most of the world’s electricity is generated in power stations that burn fossil fuels.
State one environmental problem that burning fossil fuels produces.
.....................................................................................................................................
.....................................................................................................................................
(1)
Page 40 of 72
(c)
Electricity can be generated using energy from the wind. A company wants to build a new
wind farm. Not everyone thinks that this is a good idea.
(i)
What arguments could the company give to persuade people that a wind farm is a
good idea?
...........................................................................................................................
...........................................................................................................................
...........................................................................................................................
...........................................................................................................................
(2)
(ii)
What reasons may be given by the people who think that wind farms are not a good
idea?
...........................................................................................................................
...........................................................................................................................
...........................................................................................................................
...........................................................................................................................
(2)
(Total 9 marks)
Page 41 of 72
Q34.
Much of the world’s electricity is generated in power stations that burn fossil fuels.
(a)
The bar chart shows the start-up times for the three types of fossil fuel power station.
Which of these power stations would take the longest to start generating electricity?
.....................................................................................................................................
(1)
(b)
Which two of the following statements are good reasons for using fossil fuels to generate
electricity?
Put a tick ( ) in the box next to each of your choices.
Supplies of fossil fuels are limited.
Fossil fuels can be used to generate electricity at any time.
Fossil fuels are non-renewable.
A few large power stations can generate the electricity for a million homes.
Burning fossil fuels produces carbon dioxide.
(2)
(c)
Electricity can be generated using energy from the wind.
(i)
Why does a wind-powered generator not produce carbon dioxide?
...........................................................................................................................
...........................................................................................................................
(1)
Page 42 of 72
(ii)
Which form of energy is transferred from the wind to generate electricity?
Draw a ring around your answer.
heat
kinetic
light
sound
(1)
(iii)
Many people say that wind-powered generators are a good idea because:
“when the wind blows they generate electricity”
“they produce no pollution”
“they generate electricity cheaply”
But not everyone wants more wind-powered generators to be built.
What reasons may be given by the people who think that wind-powered generators
are not a good idea?
...........................................................................................................................
...........................................................................................................................
...........................................................................................................................
...........................................................................................................................
(2)
(Total 7 marks)
Page 43 of 72
What reasons may be given by the people who think that wind-powered generators
are not a good idea?
...........................................................................................................................
...........................................................................................................................
...........................................................................................................................
...........................................................................................................................
(2)
(Total 7 marks)
Q35.
Much of the world’s electricity is generated in power stations that burn fossil fuels.
(a)
The bar chart shows the start-up times for the three types of fossil fuel power station.
Which of these power stations would take the longest to start generating electricity?
.....................................................................................................................................
(1)
Page 44 of 72
(b)
Which two of the following statements are good reasons for using fossil fuels to generate
electricity?
Put a tick ( ) in the box next to each of your choices.
Supplies of fossil fuels are limited.
Fossil fuels can be used to generate electricity at any time.
Fossil fuels are non-renewable.
A few large power stations can generate the electricity for a million homes.
Burning fossil fuels produces carbon dioxide.
(2)
(c)
Electricity can be generated using energy from the wind.
(i)
Why does a wind-powered generator not produce carbon dioxide?
...........................................................................................................................
...........................................................................................................................
(1)
(ii)
Which form of energy is transferred from the wind to generate electricity?
Draw a ring around your answer.
heat
kinetic
light
sound
(1)
Page 45 of 72
(iii)
Many people say that wind-powered generators are a good idea because:
“when the wind blows they generate electricity”
“they produce no pollution”
“they generate electricity cheaply”
But not everyone wants more wind-powered generators to be built.
What reasons may be given by the people who think that wind-powered generators
are not a good idea?
...........................................................................................................................
...........................................................................................................................
...........................................................................................................................
...........................................................................................................................
(2)
(Total 7 marks)
What reasons may be given by the people who think that wind-powered generators
are not a good idea?
...........................................................................................................................
...........................................................................................................................
...........................................................................................................................
...........................................................................................................................
(2)
(Total 7 marks)
Page 46 of 72
M1.
ideas that
•
direct solar radiation will provide enough energy to heat the (specially designed) buildings
during the period Oct-Mar / summer
•
solar cells will produce plenty of electricity in Oct-Mar / summer (when wind generators
produce little)
•
a couple of wind generators will produce all electricity needed (for all but heating) Apr-Oct /
winter
•
number required makes wind generators unsuitable for heating / buildings
•
no solar energy in June and July / little in winter
•
solar / wind have little effect on environment
•
or cause no air pollution
•
solar and wind complement each other
•
or together provide energy all year
•
fuel / gas / diesel can provide energy all the time / at any time
•
fuel / gas / diesel needed for transport
•
fuel / gas / diesel needed for heating in winter
•
diesel has to be imported
•
diesel likely to freeze
•
gas wouldn’t have to be imported
•
drilling for gas difficult / harms environment
•
but atmospheric pollution a global rather than local matter so any produced in Antarctic
doesn’t matter much
(deduct 1 mark (to minm. zero) for incorrect claims about destroying ozone layer)
•
gas produces less carbon dioxide (for the same energy released) than diesel*
•
gas produces less sulphur dioxide (for the same energy released than diesel*
(* these ideas met by candidates in Q.16 so must be allowed, though not required)
any ten for 1 mark each
[10]
Page 47 of 72
M2.
(a)
(i)
(ii)
5
(iii)
30
65
[credit 1 mark if (i) + (ii) + (iii) = 100 or if (i) > (iii) > (ii)]
for 1 mark each
3
(b)
heating local schools saves 16+ J / 16.25
better cables saves 2.5 J
better lamps saves 2.4 J (out of each 100 J)
for 1 mark each
best to use waste heat to heat schools
for 1 mark
4
(NB credit answer consistent with own calculations – even if these
incorrect but must be based on at least 2 derived figures)
(c)
(i)
/ 0.03(3) / 3(.3)%
(credit correct fraction even if incorrectly converted to %)
(ii)
/ 0.1 / 1%
for 1 mark each
2
[9]
M3.
(a)
(ii)
(i)
30
65
(credit 1 mark for incorrect figures if
they total 95 and in correct order of size)
for 1 mark each
2
(b)
use quarter of heat wasted at power stations to heat nearby schools
saves most energy/wastes least energy/save 16+J compared to 2.5J out
of every 100J (accept approximate figures.)
for 1 mark each
2
[4]
Page 48 of 72
##
(a)
cooking and heating water 30
heating rooms 50
each for 1 mark
2
(b)
coal
idea that amount used fell/declined/line goes down
gains 1 mark
but idea that fall/decline is steady/gradually/approx halved
gains 2 marks
gas
ideas that
amount used rose/increased
in/from 1980/more used before 1980/ref to 1980
as an important date/rapid increase in use
(credit idea that gas>coal from c.1990
in either part with 1 mark (to maximum 4)
each for 1 mark
max 4
(c)
•
less carbon dioxide produced
•
less change to weather/food production/gained
warming/water levels (no mark for “greenhouse gas” alone)
•
no/less sulphur dioxide produced/coal produces sulphur dioxide
•
less acid rain/damage to fish/buildings/trees/crops/animals/tumours etc
(do not credit reference to cost unless : cheaper so can spend more on
environment)
(“It” used in an answer will refer to “gas”) any 3 for 1 mark each
3
[9]
M5.
3
20
0.3
each for 1 mark
[3]
Page 49 of 72
M6.
(a) sectors closer to correct value than ± 1% nuclear (5%)
gas 24% moving water 1%
each for 1 mark
maximum of 2 marks
3
sectors labelled correctly w.r.t. rank order of size
for 1 mark
But deduct 1 mark if not all sectors used
(b)
5 × as much
4 × as much
(do not credit simply more/4% more)
1
(c)
wind/waves/solar/tides
(allow geothermal/wood/biomass)
any one for 1 mark
1
(d)
idea that
electricity is a secondary/man made source/needs another
source to produce it
for 1 mark
1
[6]
##
(a)
sectors nearer to correct value than to 1% either side
coal
35%
nuclear
5%
gas
24%
moving water
1%
each for 1 mark to a maximum of 3 marks
deduct 1 mark if sector left blank
three sectors labelled correctly w.r.t. rank order of size
for 1 mark
4
(b)
(fossil) fuels (allow combustible/flammable/non renewable)
1
(c)
moving water/hydro
wind/waves/tides/solar (allow geothermal/
wood/biomass)
each for 1 mark
2
Page 50 of 72
(d)
any indication that we get more (energy from nuclear sources)
gains 1 mark
but
5 times as much/more
gains 2 marks
2
[9]
M8.
(i)
gravitational or potential
do not accept stored
1
light
credit solar
1
kinetic or movement
credit moving
1
chemical
1
(ii)
any one from
gas
coal
1
(iii)
any one from
oil
do not accept petrol or paraffin
peat or turf
nuclear
credit coal or gas if not given as answer to part (ii)
do not accept wood or fossil fuel or chemical
1
[6]
Page 51 of 72
M9.
(a)
mark independently
(from) gravitational
accept potential
do not credit stored
1
(to) kinetic
accept movement
1
(b)
advantage
* the current can be low (for the same power)
* less energy or heat loss or power loss
accept the cables do not have to be (so) thick
accept less cost to support higher (rather than heavier) cables
accept aluminium can be used and aluminium is cheaper than
copper
do not credit efficient or cheaper
do not credit no loss of energy
do not credit electricity loss
2
disadvantage
* it is difficult to insulate high voltage
* pylons have to be taller and so more expensive
...to give a good separation between them and the
ground /people/high vehicles
or ... to prevent/reduce the danger of electric shock or lethal
do not credit dangerous
do not credit get a shock
do not credit reference to step down transformers or
electromagnetic field
2
[6]
M10.
(a)
any two from
reliable
accept it is not always windy
can be used as storage for surplus electricity
generates more electricity
accept would need hundreds of wind turbines to generate this
electricity
takes less space is neutral
no noise pollution
do not accept can be started up quickly
2
Page 52 of 72
(b)
advantage :
does not produce greenhouse gases / carbon dioxide / water
or acid rain / sulphur dioxide
1
disadvantage :
danger from radioactive materials if accidents or waste radioactive materials
accept slower start-up time
1
(c)
any one situation with a suitable explanation
satellite
weigh less or work for many years or remote
remote places on Earth pump water or operate phones or road signs / lights or
weather stations or too expensive / impractical
calculators / watches small amount of electricity needed
2
[6]
M11.
(a)
20
accept twenty
1
(b)
correct division 35/15
1
larger area labelled coal
accept smaller area labelled oil
1
(c)
can be started up very quickly
1
(d)
(i)
carbon dioxide
1
(ii)
sulphur dioxide
accept nitrogen oxidestotal
1
[6]
Page 53 of 72
M12.
(a)
(oil / natural gas / coal)
no marks are given for choosing the correct non-renewable energy
source
burning releases carbon dioxide (1) greenhouse effect (1)
OR
allow 2 effects for 2 marks
burning (releases sulphur dioxide (1) acid rain (1)
OR
(nuclear power)
no marks given for choosing the correct non-renewable energy
source
accidents can release very dangerous radioactive material (1)
produces waste that stays dangerously radioactive for thousands of years or
radioactive waste has to be stored safely for thousands of years (1)
accept the cost of installation and decommissioning is high
2
(b)
any four from:
(wind power)
no marks are given for choosing the correct non-renewable energy
source
•
considered unsightly / visual pollution (1) very large areas of land (1)
•
noisy for people living nearby / noise pollution (1)
(tidal power)
no marks are given for choosing the correct non-renewable energy
source
•
barrages / visual pollution (1)
•
destroys the habitat of many living organisms (1)
(hydroelectricity)
no marks are given for choosing the correct non-renewable energy
source
•
damming / visual pollution (1)
•
very large areas of land (1) flooding (1)
4
[6]
Page 54 of 72
M13.
do not give any credit for renewable or non-renewable or installation or decommissioning
costs
fossil fuel advantage
1
a reliable source of energy
fossil fuel disadvantage
pollution by carbon dioxide /
accept causes acid rain
accept highest costs / more expensive than nuclear / more
expensive than renewable
1
nuclear advantage
do not produce gases that increase the
greenhouse effect or cause acid rain
accept nuclear is cheaper than fossil
1
nuclear disadvantage
accidents / waste can release very dangerous radioactive material radiation
accept it produces waste that stays dangerously radioactive for
thousands of years or radioactive waste has to be stored safely for
thousands of years
1
renewable advantage
there are no fuel costs
almost pollution free (apart from noise and visual)
accept cheaper than fossil
1
renewable disadvantage
not a reliable source of energy except for hydroelectric
accept (most) require large areas of land
accept visual / noise pollution
1
[6]
Page 55 of 72
M14.
(a)
Using wind (advantage)
any one from
can be used in remote locations
renewable
clean
accept does not cause pollution to the air / land
1
Using wind (disadvantage)
any one from
does not generate much (electrical) energy
many hundreds wind turbines would be needed
accept many hundreds wind turbines would be needed or too much
land would be needed for wind farms or wind energy is ‘dilute’
the wind is unreliable
accept the wind does not blow all of the time or the wind is not
always strong enough
noise / visual pollution
do not accept just the word pollution
1
Using coal (advantage)
any one from
can generate electricity all of the time
accept reliable electrical / energy supply
generates a lot of (electrical) energy
1
Using coal (disadvantage)
any one from
pollution by carbon dioxide / greenhouse gas
accept slow start-up time or production of ash or difficult to
transport (coal) or there’s not much coal left
non renewable
pollution by sulphur dioxide acid rain
1
Page 56 of 72
(b)
all link lines correct
accept one link line correct for one mark
2
[6]
M15.
Read all the answer first. See below.
Mark the first two advantages and disadvantages (√ or X) ignoring
neutral answers. Only allow a third advantage if there is only one
disadvantage given. Only allow a third disadvantage if only one advantage is given.
max. 3 advantages (e.g. cheap fuel, good availability, saving fossil fuels,
low running costs, reliable, more energy / kg, less fuel needed, no
greenhouse gases emitted, no SO2 causing acid rain)
max. 3 disadvantages (e.g. danger to health of local community, non
renewable, high cost of decommissioning, long half life of waste
materials, need for safe storage of waste, high cost of commissioning,
danger involved in transporting fuel / waste)
max. 4 marks
[4]
M16.
(a) must give one advantage and one disadvantage of each to get 4 marks
and 2 further scoring points
Advantages and disadvantages relevant to:
(1) health risk
(5) cost
(6) environmental factors
(7) transport/ storage
e.g. common coal / nuclear – high cost of building both
anti-nuclear examples
nuclear fuel transported on roads/rail in region
possible effects on public health in surrounding area
high cost of de-commissioning
long life very active waste materials produced
how waste materials stored safely for a long time
anti-coal examples
unsightly
pollution
supplies of fuel limited
acid rain
non-renewable
pro-nuclear examples
fuel cheap
no foreseeable fuel shortage
Page 57 of 72
pro-coal examples
safe
reliable
large coal reserves
disposal of solid waste is easier
to max 6
6
(b)
choice 0 marks
any three valid reasons each with explanation, which may or may not
be comparisons with other fuel
But
at least two of which must be relevant to this site
3
[9]
M17.
(a)
(i)
much ash produced
acid rain
global warming/greenhouse effect
any 2 for 1 mark each
2
(ii)
landscaping/road building*
removal of exhaust gases*
use alternative source not producing
CO2* (*sequential (i))
for 1 mark each
2
(b)
(i)
E = 5 × 108 × 3600 × 24 J/day
× 4 (for 4 generators) (sequential on P × t) = 1.73 × 1014 (J/day)
for 1 mark each
3
(ii)
2.66 × 1010 × 18 829 = 4.86 × 1014
for 1 mark each
2
(iii)
Eff = output/input
Eff = 1.73/4.86
Eff = 0.36 or worked to a percentage
for 1 mark each
3
Page 58 of 72
(c)
(i)
boiler – heat to surroundings
turbine – not all steam energy used/heat/sound lost to surroundings
generator – heat in wires/coils/heat to surroundings
transformer – heat in wires/coils/heat to
surroundings
any 1 for 1 mark
1
(ii)
energy spread out/diluted
as surroundings become warmer/energy lost as heat
difficult to use for further useful energy/transfers
any 2 for 1 mark each
2
[15]
M18.
the higher the voltage the smaller the current
small current gives small energy loss
in the form of heat
(or efficiency greater, or energy/heat losses low – gets 1)
for 1 mark each
[3]
M19.
coal has chemical energy
when burnt heat/energy produced
longest
used to boil water/make steam
sequence
used to turn turbine(s)
which now have ke
turbine(s) turn generator(s)
(where (ke) transferred electrical energy)
(or electrical energy produced
)
any 5 for 1 mark each
[5]
M20.
(a) 90% of 2.1011
2.16.1011
2
(b)
(i)
Can be located anywhere
Continuous output
Sustain coal industry
any 2 for 1 mark each
(ii)
Low running cost
No atmospheric pollution
Gives calm coastal waters
any 2 for 1 mark each
Page 59 of 72
(iii)
High installation costs – built in sea
Coast environmental damage – wildlife disturbance
Time dependence – need dropping tide
any 2 for 1 mark each
(1 for a valid disadvantage, 1 for reason)
6
[8]
M21.
To gain marks the candidate must
1.
Select one option
Advantages
)
Max 4
2.
State 8 valid advantages/disadvantages/relevant
comparisons with either of the alternatives
Disadvantages) Min 1
Comparisons )
If no A or D or C then Max 4
No option then Max 4
Look for As, Ds for chosen scheme.
Then for Cs compared with A/D for chosen scheme.
Below are listed some of the relevant mark scoring points.
Advantages
Disadvantages
Wind
Land available to North
Initial cost
No pollution
Many windmills/much land
Close/low transmission costs Calm day problem
No fuel costs
Few long term jobs
Renewable energy resource
Coal
Waste land to North
Prevailing wind to East
Good road/rail transport
Close/low transmission costs
Save coal industry
Overall labour intensive
Hydroelectric No pollution
Mountains/lake/river nearby
No fuel costs
Renewable energy source
Pollution
Initial costs
Fuel costs
Non-renewable energy
Resource
Possible drought
Distant/transmission costs
Few jobs created
Possible expensive underground
transmission cable
Construction of dam affects environment
[8]
M22.
(i)
reduces
for 1 mark
1
(ii)
less heat/energy/power wasted (in power lines)
for 1 mark
1
Page 60 of 72
(iii)
for safety
for 1 mark
1
[3]
M23.
(a)
(i)
sources of energy
for 1 mark
(ii)
wood
coal
oil
gas
all correct gains 2 marks
3 correct gains 1 mark
3
(b)
geothermal
tides
wind
solar
nuclear
all correct gains 2 marks
4 correct gains 1 mark
2
(c)
non-renewable fuels cause pollution (or reverse)
conserve/limit use of coal/gas/oil;
so supplies last longer/renewable sources can be replaced
any 2 from 4 for 1 mark each
2
[7]
M24.
any one from:
basic idea of reduced use of fuels to heat homes or offices or
st
shops for 1 mark
less (heat) energy wasted (to the environment)
reduced demand for fuels to heat homes etc
simply re-quoting figures gets no credit
1
Page 61 of 72
any one from:
nd
idea of less pollution for the 2 mark
reduced (air) pollution
do not accept no pollution
fewer power stations required or less electricity needs to be produced
less (fossil) fuels being burnt (in power stations)
reduced greenhouse effect
reduced global warming
1
[2]
M25.
(a)
(i)
correct links shown
4
1 link for 1 mark
2 links for 2 marks
3 links for 3 marks
4 links for 3 marks
5 links for 4 marks
do not credit if more than one link
goes to or from any box
(ii)
nuclear (power station)
do not accept power station
1
Page 62 of 72
(b)
(i)
heat from the Sun
1
(ii)
kinetic
1
(iii)
insufficient wind (to turn turbine)
accept wind does not always blow
do not allow it does not always work or it is switched off
do not accept wind in wrong direction
1
[8]
M26.
(a)
(i)
photosynthesis for growth
accept plants require sunlight for growth
1
plants change into coal
any mention of animals negates second mark
1
(ii)
burning
do not accept heating
accept combustion
1
(b)
(i)
heat
1
(ii)
less heat radiated into space
accept increased insulation round earth
accept reflects heat back to earth
accept greenhouse effect
accept traps heat or energy
1
[5]
M27.
(a)
(i)
3
1
(ii)
1
accept a definition of frequency ignore units
1
(iii)
hertz
1
Page 63 of 72
(b)
straight line in correct direction
judge by eye (from ‘a’ of waves to ‘s’ of across) ignore arrow
accept equal angles shown on waves
1
(c)
(i)
gets smaller
1
(ii)
kinetic
accept movement
1
(iii)
renewable
1
[7]
M28.
(a)
internal or thermal or heat or kinetic or movement
electrical
both answers required for one mark
1
(b)
(i)
Sun or solar
do not accept sunshine
1
(ii)
any one of the follow:
•
wind turbines produce no (gaseous) pollutants
•
wind turbines use renewable energy
•
wind turbines produce no (solid) waste
•
reduced running costs
do not allow safety
1
a supporting statement or comparison or explanation
1
[4]
M29.
(a)
hydrogen converted to helium
1
(nuclear) fusion
1
((small) loss in mass) which is converted to large amount of energy
1
Page 64 of 72
(b)
(i)
any two from
it is running out/ takes millions of years/finite
not non renewable
allow acid rain do not allow waste
pollution or problem with CO2 production
allow a specific example
more responsible to use fossil fuels for
(important) chemical functions
2
(ii)
any three from
need lots of land for generators or many generators needed
generators may not be conveniently located
uncertainty of supply
accept the wind may not always blow
social resistance or visual pollution
noise pollution
high initial costs
(possible) interference with (local) radio and TV signals
3
[8]
M30.
(a)
light
1
electrical
1
(b)
15% or 0.15
correct substitution gains 1 mark only an answer of 15 with no unit
or an incorrect unit gains 1 mark an answer of 0.15 given with a
unit gains 1 mark
2
(c)
the ticket machine is a long way from other electricity supplies
1
Page 65 of 72
(d)
any figure between 5 and 10 inclusive
unit not required but if given must match numerical answer
1
[6]
M31.
(a)
generator
accept dynamo
accept alternator
1
(b)
(i)
1400
ignore units
1
(ii)
0.3 or 30%
any incorrect unit penalise 1 mark
allow 1 mark for the correct use of 600
or 0.3% or 30
2
Page 66 of 72
(c)
1 mark for each correct link
if more than 3 lines are drawn, mark only
3 lines starting with those that are incorrect
3
(d)
(i)
110
no tolerance
1
(ii)
12
no tolerance
1
(iii)
wind speed may be too low to operate the generator
accept wind may not always blow
accept power depends on wind speed
accept does not generate if wind speed is too high
accept does not generate if wind speed is above 12 (m/s)
accept does not generate if wind speed is below 1.6 (m/s)
accept it is unreliable
do not accept answers referring to cost only
1
[10]
M32.
(a)
gas
1
(b)
fuel burning stations produce electricity at any time / all the time
accept fuel available all the time
1
wind generator can only produce when the wind is strong enough
accept it’s not always windy
1
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(c)
no fuel is burnt or no fuel is used or uses only energy from wind or
does not emit harmful gases / soot / smoke
do not accept wind is natural / environmentally friendly / renewable
answer must be in terms of wind, not negative of fuel burning
specific examples of gases CO2, SO2,
acid rain and greenhouse gases can be accepted
ozone negates credit
1
[4]
M33.
(a)
(i)
national grid
1
(ii)
increases voltage / potential difference
accept decrease current
accept step-up / boosts the voltage
do not accept increases energy / power / current
ignore reference to voltage going through
1
(iii)
any two from:
•
reduce current
ignore increased voltage / pd
•
reduces energy loss / power loss (from cables)
accept reduces heat loss
do not accept stops energy loss
•
increases efficiency (of distribution)
2
(b)
any one from:
•
produces pollutant gases
accept produces carbon dioxide / sulfur dioxide / nitrogen oxides
accept global warming / greenhouse effect / carbon emissions / air
pollution / acid rain
ignore ozone layer
do not accept carbon monoxide
•
produces solid waste / ash / smoke
accept global dimming
ignore produces pollution
1
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(c)
(i)
any two from:
any two valid points gains the marks
•
using renewable energy
accept don’t use up non-renewable / fossil fuels
accept named fuels
•
non-renewable fuels can be used for other processes
•
no pollutant gases produced
accept the opposite of (b)
ignore no pollution
•
land can still be used for farming
ignore economic issues
2
(ii)
any two from:
•
cause noise pollution
•
cause visual pollution
accept spoils the landscape
accept sunlight flicker
•
may interfere with TV / radio / mobile phone signals
•
need to put in new infrastructure
accept new roads needed
•
not reliable owtte
•
dangerous to birds
•
lots of concrete needed for the bases
or
producing cement is environmentally damaging
accept reduces house prices
ignore any references to cost / jobs / number required
ignore takes up a lot of land
accept reference to obstruction of shipping etc. if clear reference
tooffshore wind farm
2
[9]
M34.
(a)
coal
1
(b)
fossil fuels can be used to generate electricity at any time
if more than 2 boxes ticked, mark incorrect boxes first
1
a few large power stations can generate the electricity for a million homes
1
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(c)
(i)
no fuel is burnt
accept a named fuel
accept nothing is burnt
accept does not use (fossil) fuel
1
(ii)
kinetic
1
(iii)
any two from:
accept causes pollution for 1 mark
•
need concrete for bases
•
new roads / infrastructure needed
•
may interfere with TV / radio / mobile
phone signals
•
dangerous to birds
•
do not generate all of the time
accept generates only when the wind blows
do not accept ‘generate when the wind blows’
•
need a lot of generators
do not accept ‘take up a lot of space / land’
•
high initial / capital costs
•
reduces house prices
2
[7]
M35.
(a)
coal
1
(b)
fossil fuels can be used to generate electricity at any time
if more than 2 boxes ticked, mark incorrect boxes first
1
a few large power stations can generate the electricity for a million homes
1
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(c)
(i)
no fuel is burnt
accept a named fuel
accept nothing is burnt
accept does not use (fossil) fuel
1
(ii)
kinetic
1
(iii)
any two from:
accept causes pollution for 1 mark
•
need concrete for bases
•
new roads / infrastructure needed
•
may interfere with TV / radio / mobile
phone signals
•
dangerous to birds
•
do not generate all of the time
accept generates only when the wind blows
do not accept ‘generate when the wind blows’
•
need a lot of generators
do not accept ‘take up a lot of space / land’
•
high initial / capital costs
•
reduces house prices
2
[7]
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Page 72 of 72