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KS3 Energy.

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Presentation on theme: "KS3 Energy."— Presentation transcript:

1 KS3 Energy

2 The ULTIMATE energy source
The sun is the ultimate source of all our energy. For example, we often get energy from beef: BEEF comes from COWS, COWS eat GRASS, GRASS gets energy from the sun by PHOTOSYNTHESIS

3 The 9 types of energy Type 3 example sources Heat Kinetic (movement)
Nuclear Sound Light Chemical Electrical Gravitational potential Elastic potential

4 Electricity Light + heat
Energy changes To describe an energy change for a light bulb we need to do 3 steps: 1) Write down the starting energy: 3) Write down what energy types are given out: 2) Draw an arrow Electricity Light + heat What are the energy changes for the following…? An electric fire A rock about to drop An arrow about to be fired

5 Conservation of Energy
In any energy change there is ALWAYS some “waste” energy: e.g. a light bulb: Electricity Light heat In this example HEAT is wasted – it’s given to the surroundings. Waste energy is virtually always heat and it’s always given to the surroundings.

6 Heat transfer 1) Conduction – this is when heat is passed on through a solid by vibrations of particles: 2) Convection – this is when “heated stuff” moves somewhere else and takes heat with it: 3) Radiation – this is when heat is moved by “heat waves” (infra-red) – this is how heat reaches us from the sun:

7 Power stations Generator Turbine Cooling tower Transformer Boiler

8 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

9 Renewable vs. non-renewable fuels
A ________ energy source is blatantly one that can be _______ (“renew = make again”), e.g. _____, solar power etc. Biomass is also an example of a renewable energy source – ______ is a form of biomass. A ___________ energy source is one that when it has been used it is gone forever. The main examples are ____, oil and gas (which are called ______ ____, as they are made from fossils), and nuclear fuel. Words to use – non-renewable, coal, wind, renewable, fossil fuels, wood, renewed

10 Non-renewable energy sources
Advantages Disadvantages Pollution – CO2 leads to global warming and SO2 leads to acid rain Cheap fuel costs Coal, oil, gas and nuclear Good for “basic demand” Fuel will run out Costs a lot of money to decommission a nuclear plant Short start-up time

11 Other ways of generating electricity…
Can we drive the turbine without burning anything?

12 Other ways of generating electricity…
Wind Hydro-electric Wave Tidal

13 Renewable energy sources
Advantages Disadvantages Often depend on the weather – is it sunny??? Clean Coal, oil, gas and nuclear Won’t run out Very expensive Energy is “dilute” – in other words, it’s very spread out Easily accessible

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