Chemical Potential —>____
Energy Resources
Complete the labels to
show where useful energy transfers take place in a typical
coal power station.
State one advantage and one
between coal and nuclear power stations?
___________________________
______________________________________________
____
______________________________________________
disadvantage of using coal.
____ Draw energy transfer diagrams for generating
____ —> Kinetic
electricity using coal, nuclear, and solar power.
Name:
_______ —> ________
Energy Revision
Booklet
_____________________________________________
Class:
Energy can be viewed as coming in many different forms.
_____
Identify the forms of energy shown below.
_____________________________________________
_____ What are the similarities and differences
Pictures from E-On
Energy Transfer
Law of Conservation of Energy
This
law
states
that
______________________________________
________________________________________________
___ A bungee jumper has 1.2 MJ of gravitational potential
energy. Draw an energy transfer diagram to show the energy What is the wasted energy in this process?
_______________________ What percentage of the
transfers from the time he jumps until the
time he reaches the bottom of the first ‘bounce.’
energy input is transferred to elastic potential energy?
When the bungee is fully extended it stores 1.0 MJ of
_________________________________________________
__%
Particles in heated substances have more kinetic
elastic potential energy. Draw an energy flow (Sankey)
energy and they vibrate more. This causes the hot
diagram to show the energy transfer process.
substance to expand and become less dense. Less
dense areas in fluids will rise above the cooler, denser
areas. Using the picture to the right,
explain how a radiator uses
convection to heat an entire room.
Reducing Heat Loss from Houses
Method... Prevents... Because...
Double glazing
Cavity wall insulation
Draught excluders
Thermal Energy
Thermal, or heat energy, can be transferred in three
______________________
_____________________________________________
____
_____________________________________________
____ Radiation
Thermal energy can also be
transferred as
_______ waves. Particles are
not required for
radiation and so it can travel
through a _____.
Matt black surfaces are good
________ and
emitters of thermal radiation.
Light shiny
surfaces are poor absorbers and emitters of
thermal radiation, they ______ it instead.
Words: vacuum infra-red absorbers reflect
ways; ________, _________, and ________. Thermal
energy is transferred from hotter places to colder
places.
Conduction
The efficiency of a system is the ratio of total energy
input to useful energy output. It is given by the
equation:
Explain, using the
diagrams, how
conduction
transfers heat.
Efficiency can be given as a percentage by
multiplying by ___. Sample Questions
A car engine releases 100 000 J of energy from burning
____________________________________________
petrol. 40 000 J is transferred to kinetic energy and
_____
electrical energy for lights, radio, etc. 60 000 J is wasted
____________________________________________
as heat and sound. What is the efficiency of the system?
_____
______________________________________________
Why are metals better conductors than non-
metals?
______
____________________________________________
______________________________________________
_____
______
____________________________________________
______________________________________________
_____ Conduction occurs in solids, liquids and gases.
______ An old 100 W light bulb transfers 100 J of energy
Liquids and gases have an other method of heat
every second. 10 J of this energy is released as light, the
transfer more suited to their properties... Convection
remainder is released as heat. A newer bulb transfers 90
Convection transfers heat through fluids due to the
J of every 100 J to light energy, and the remainder to heat.
different densities of hotter and cooler regions in the
Which bulb is the most energy efficient?
fluid.
_____________________________
Efficiency
______________________________________________
______
______________________________________________ ______________________________________________
______ A kettle is 80% efficient. How much energy must
_____ The bungee jumper on page 2 has a mass of 100
be supplied to provide 8000 J of heat energy?
kg. How high must he be?
_________________________________________________ ______________________________________________
___ _____
Work, Energy & Power
______________________________________________
Energy & Work
_____
What is the equation that links work and force?
______________________________________________
____________________ A car has an average driving
_____ A red panda climbs 4 m up a tree and gains 260 J
force of 700 N and drives for 1.2 km. How much work is
GPE. What is the mass of the red panda?
done?
_________________________________________
__________________________________________ Roy
______________________________________________
is moving house. He does 500 J of work moving boxes
_____
with a force 5 N. How many meters does he move the
______________________________________________
boxes? _______________________
_____
______________________________________________
Kinetic Energy
_____ Gravitational Potential Energy
What is the equation that links mass, velocity, and KE?
What is the equation for calculating GPE?
________________ A Year 11 pupil (mass 50 kg) is
________________________ Roy arrives at his new flat
running frantically at 7 m/s to reach her exam on time.
and must move his boxes (mass 0.5 kg) up three flights of
How much kinetic energy does she have?
stairs. Each flight of stairs is 2 m high. How much GPE
___________________
does each box gain?
_______________________________________________
______________________________________________
____ A tortoise (3 kg) has a kinetic energy of 0.135 J. What
_
is its speed?
_______________________________________________
____
_______________________________________________
____ GPE and KE
A kite of mass 0.5 kg is flying 5 m above the ground. What
is its GPE?
_______________________________________________
____ If the wind suddenly stops blowing, and assuming all
GPE is converted into KE, how fast will the kite hit the
ground? ____________________________
_______________________________________________
____
_______________________________________________
____ Power
How is power calculated?
___________________________________ A lift of mass
1000 kg raises up 5 m in 10 s. How much GPE does the lift
gain?
_______________________________________________
____ What is the power of the motor?
_______________________________________________
_____
_______________________________________________
_____