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KS3 Energy
Energy sources and energy transfer
| Question | Answer |
|---|---|
| Name 6 renewable energy resources | Solar cells, Hydroelectricity, Wind turbines, geothermal, tidal power and wave power (3 linked to water; wind; sun and hot rocks) |
| Name 4 non-renewable sources of energy | Coal, oil, gas and uranium |
| What does "renewable" mean? | The resource can be replaced quickly |
| What does "non-renewable" mean? | The resource can be replaced quickly |
| What is the drawback of Solar cells? | They do not work at night. |
| What are solar cells? | Like the ones on your calculators: they convert light energy into electrical energy |
| What is the benefit of solar cells | Works best in summer |
| How is hydroelectricity generated? | Falling water turns turbines that turn a generator |
| What is the benefit of hydroelectricity? | It can be started (and stopped) very quickly; it works by all weather |
| What is the drawback of hydroelectricity? | You need to build dams across mountains and that destroys habitats;there are not many suitable places |
| What is tidal power? | When the tide turns turbines that turn a generator |
| What is the benefit of tidal power? | It comes on at predictable times |
| What is the drawback of tidal power? | You need to build dams across an estuary (river mouth)and that destroys habitats; there are not many suitable places |
| What is geothermal energy? | When the hot rocks turn water into steam; the steam then turns turbines that turn a generator |
| What is the benefit of geothermal energy? | Available all the time |
| What is the drawback of geothermal energy? | Only available in certain places/volcanic areas like Iceland |
| What is wave power? | As a sea wave passes through, air is moved up and down; this turns a turbine that turns a generator |
| What is the benefit of wave power? | Available all the time (best in winter) |
| What is the drawback of wave power? | People may oppose them |
| What is the drawback of wind turbines? | Some people think that they spoil the landscape, that they are noisy; they need wind (work best in winter) |
| What is the benefit of power stations that use coal, oil or gas? | Available all the time: reliable source of energy. Produces a lot of energy (more cheaply than renewable sources). |
| What are TWO advantages of gas over coal or oil? | No Sulphur Dioxide produced. Less Carbon Dioxide (for same amount of electricity produced) |
| What are TWO drawbacks of power stations that use coal, oil or gas? | They produce Carbon Dioxide (responsible for global warming) and Sulphur Dioxide (responsible for acid rain) |
| What is the test for Carbon Dioxide? | When Carbon Dioxide is bubbled through Limewater, the Limewater turns cloudy |
| What is the test for Sulfur Dioxide? | Sulfur Dioxide makes pH paper turn red |
| What is the test for Water? | You would see condensation (little droplets of water); Also water makes cobalt chloride paper turns from blue to pink |
| Describe the 5 stages for the formation of crude oil | Microscopic sea animals die; covered by sand; no oxygen; does not decompose; millions of years |
Created by:
ursulinephys2
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