generating electricity. energy changes to describe an energy change for a light bulb we need to do 3...

Generating ElectricityGenerating Electricity

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?

Power stationsPower stations

Cooling tower

Turbine

Generator

Transformer

Boiler

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

Other ways of generating Other ways of generating electricity…electricity…

Can we drive the turbine without burning anything?

Other ways of generating Other ways of generating electricity…electricity…

Wind

TidalWave

Hydro-electric

Solar

Where do animals and Where do animals and Plants get their energy Plants get their energy

from?from?

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.

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!)

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.