Summary: Energy Test
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1 Energy test
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What percentage of air consists of oxygen?
- Oxygen: 20%
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What three things are required for combustion?
- Flame/fuel
- Oxygen
- Heat
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Give an example of input and output energy using a battery-powered toy.
- Input: Batteries in the toy.
- Output: Toy moves or makes sounds.
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What is required to start burning fuels?
- Fuels need energy to start burning.
- Example: A burning match provides input energy.
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Explain input and output energy using food.
- Input: Food consumed.
- Output: Energy for running, playing, doing things.
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What is coal and how is it formed?
- Coal: a fossil fuel from ancient plants.
- Formed under Earth's pressure.
- Plants buried and transformed over time.
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How does burning fuel release energy?
- Unlocks stored energy
- Molecules react with oxygen
- Releases heat and light
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What happens when fuels start burning?
- Stored energy is released.
- Energy changes to heat and light.
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What is the useful output energy of coal?
- Used for: Cooking, electricity.
- Output: Heat energy.
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What type of energy do petrol and diesel provide to cars?
- Cars receive energy from
- Petrol
- Diesel
- This enables them to move.
- Cars receive energy from
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