thinking about electricity learning objectives to know that we can make electricity in different...
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?
• Most of our electricity is made using fossil fuels.
gas oil coal
Why do you think these are called fossil fuels?
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 can’t see.
When we burn fossil fuels we put lots of carbon dioxide into the air. This is a cause of Global Warming.
Let’s End Today with a Thought
• So, let’s combine the article and this PowerPoint and talk about nonrenewable resources.
• Why do we continue to use nonrenewable resources knowing that they are bad for the environment?
• What can we do to change this?
It takes millions of years to make fossil fuels
• What will happen when they run out?
• Because fossil fuels won’t last for ever we call them non – renewable. This means they can’t be renewed.
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 wheelsThese 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?
Renewables Non-renewables
Were you right?
Atom Electricity
Fuel an incredibly tiny particle of matter
Gas Furnace
an increase in the world’s temperature believed to be mainly caused by the greenhouse effect
something that is burned to give heat
the flow of electrical energy something that is not a liquid nor a solid at ordinary temperatures (like air)
a place where a fuel is burned, which gets very hot Generate
to produce electricity Global warming
Greenhouse effect Pollution
too much of something we don’t want in the wrong place, causing harm
a panel containing photovoltaic cells which can convert energy from the sun into electrical energy
PV panel a machine with blades that can be turned to generate power
Turbine warming of the earth’s surface caused by pollution from some gases
