generating electricity. energy changes to describe an energy change for a light bulb we need to do 3...
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Generating ElectricityGenerating Electricity
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Energy changesEnergy changesTo describe an energy change for a light bulb we need to do 3 steps:
Electricity Light + heat
But where does the electricity come from?
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Power stationsPower stations
Cooling tower
Turbine
Generator
Transformer
Boiler
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What does What does each part each part
do?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
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Other ways of generating Other ways of generating electricity…electricity…
Can we drive the turbine without burning anything?
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Other ways of generating Other ways of generating electricity…electricity…
Wind
TidalWave
Hydro-electric
Solar
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Where do animals and Where do animals and Plants get their energy Plants get their energy
from?from?
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What types of energy do What types of energy do you get from burning you get from burning
food?food?
• In pairs think of all the types of energy that food can give us. Write these down as a list.
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FoodFoodFood 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!)
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HomeworkHomework
• 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.