Presentation on theme: "Thinking about Electricity Learning Objectives To know that we can make electricity in different ways. To begin to understand how the way we get electricity."— Presentation transcript:
Thinking about Electricity Learning Objectives To know that we can make electricity in different ways. To begin to understand how the way we get electricity can affect our environment
Where does our electricity come from? Electricity is made or generated in different ways. Can you think of some? Most of our electricity is made using fossil fuels. What do you think these are? gasoil coal
Why do you think these are called fossil fuels? Can you act out this story? Millions of years ago, before the dinosaurs roamed the earth, lots of plants grew strong from the energy of the sun. Then they died and became buried in thick layers beneath lots of mud and soil. The remains of animals became buried as well. Over the millions of years, the mud and soil changed to rock and the layers above the rotting plants and animal remains grew heavier and heavier and thicker and thicker. All these organic remains (dead plants and animals) got squashed and a mixture of pressure and heat turned some organic material into coal, some into oil and some into natural gas. People found out that if they dug down deep enough and got these fossil fuels out, they could burn them to get energy.
So how do we get electricity from fossil fuels? Most electricity is produced by burning fossil fuels in power stations. Coal, oil and natural gas are burned in furnaces to heat up water. The boiling water makes steam which pushes the gigantic blades of a turbine to produce electricity. Power stations give off lots of steam which you can see. Power stations give off pollution, which you cant see. When we burn fossil fuels we put lots of carbon dioxide into the air. This is a cause of Global Warming.
It takes millions of years to make fossil fuels What will happen when they run out? Because fossil fuels wont last for ever we call them non – renewable. This means they cant be renewed. Look at a piece of coal – think how long it took it to be formed. What is it like?
Some countries use nuclear power Nuclear power plant Nuclear power plants use a material called uranium to produce electricity. Nuclear power plants make electricity by splitting tiny atoms of the uranium to release energy. Nuclear plants also have waste materials that are very dangerous and have to be looked after safely for thousands of years.
How else can we produce electricity? Wind turbines PV panels Water wheels These are some of the ways we can get renewable energy. This means that the source of the energy will not run out. How is the electricity being generated?
Now watch the film of Cassop Primary School and see how they get their electricity How does your school get its electricity? Do you use any renewables?
Glossary Atom – an incredibly tiny particle of matter Electricity – the flow of electrical energy Fuel – something that is burned to give heat Furnace – a place where a fuel is burned, which gets very hot Gas – something that is not a liquid nor a solid at ordinary temperatures (like air) Generate – to produce electricity Global warming – an increase in the worlds temperature believed to be mainly caused by the greenhouse effect Greenhouse effect – warming of the earths surface caused by pollution from some gases Pollution – too much of something we dont want in the wrong place, causing harm PV panel – a panel containing photovoltaic cells which convert energy from the sun into electrical energy Turbine – a machine with blades that can be turned to generate power
AtomElectricity Fuelan incredibly tiny particle of matter GasFurnace an increase in the worlds temperature believed to be mainly caused by the greenhouse effect something that is burned to give heat the flow of electrical energysomething that is not a liquid nor a solid at ordinary temperatures (like air) a place where a fuel is burned, which gets very hotGenerate to produce electricityGlobal warming Greenhouse effectPollution too much of something we dont want in the wrong place, causing harm a panel containing photovoltaic cells which can convert energy from the sun into electrical energy PV panela machine with blades that can be turned to generate power Turbinewarming of the earths surface caused by pollution from some gases