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15 Cards in this Set
- Front
- Back
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Where does most of our energy come from? |
Burning fossil fuels like oil, coal and gas |
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What type of energy resource are fossil fuels and nuclear fuel? |
Non-Renewable energy |
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Give some examples of biofuels. |
Methane and ethanol |
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Describe wind power and how it's generated? |
Wind turbines (an electricity generator on top of a tall tower.) The power generated increases as the wind speed increases. They are unreliable because the wind can change. |
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Describe wave power and how it's generated? |
By turning a floating generator that delivers electricity to the shore via a cable. They need to withstand storms and don't always provide constant energy. |
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Describe hydroelectric power and how it's generated? |
Collected water in a reservoir flows downhill and turns a generator. |
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Describe tidal power and how it's generated? |
A tidal power station traps each high tide and uses it to turn generators. |
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What are solar cells? |
Flat solid cells that use the sun's energy to generate electricity directly. |
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Where does geothermal energy come from? |
The energy transferred by radioactive substances deep inside the Earth. Water pumped into got rocks underground produces steam to drive turbines at the Earth's surface that generate electricity |
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Why could fossil fuels cause global warming? |
Because they produce increased levels of greenhouse gases. |
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What type of waste do nuclear fuels produce? |
Radioactive waste |
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Give advantages and disadvantages of renewable energy resources. |
Advantages: never run out; don't produce harmful waste; can be used in remote places. Disadvantages: can cover large areas and disturb habitats; not all reliable |
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How can we evaluate energy resources? |
Reliability; environmental effects; pollution and waste. |
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What are some issues with nuclear power stations. |
Expensive to build, run and decommission. |
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In the future what type of energy resource is likely to be used? |
Nuclear power and renewable energy sources. |
