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KS3 Energy

Energy sources and energy transfer

QuestionAnswer
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