Generating Electricity
Energy changes
To describe an energy change for a
light bulb we need to do 3 steps:
Electricity
Light + heat
But where does the electricity come from?
Power stations
Boiler
Transformer
Turbine
Cooling
tower
Generator
What does
each part do?
The boiler is where the fuel is burnt to boil water
The steam from the boiler is used to turn a turbine
The turbine is connected to the generator, which
acts like a dynamo – it generates electricity out of
movement
The steam is cooled down and turned back into
water in the cooling tower
Other ways of generating electricity…
Can we drive the turbine without burning
anything?
Other ways of generating electricity…
Wind
Hydro-electric
Solar
Wave
Tidal
Where do animals and Plants
get their energy from?
What types of energy do you
get from burning food?
• In pairs think of all the types of
energy that food can give us. Write
these down as a list.
Food
Food is an energy resource. The amount of energy it contains
can be measured in joules. Food contains a lot of energy, so for
most foods the energy is measured in kilojoules (1000 joules!)
Homework
• Look at food labels and find out how
much energy in kilojoules is contained
in different types of foods. Write
this as a table in the back of your
books.