•Renewable source of energy: is inexhaustible, for example solar, hydroelectric, wind etc.
•Non-renewable source of energy: is exhaustible for example fossil fuels
•fuels can be burnt (or nuclear fuel can be forced to decay) in thermal power stations to transform the chemical energy stored to thermal energy which makes steam which turns turbines (kinetic energy) to produce electricity.
-advantage: cheap, plentiful, low-tech
-disadvantage: harmful wastes -produces greenhouse gases and pollutant gases, radiation...
•hydroelectric dams: river and rain water fill up a lake behind a dam. As water rushes down through the dam, it turns turbines which turn generators.
•tidal power scheme: a dam is built across a river where it meets the sea. The lake behind the dam fills when the tide comes in and empties when the tide goes out. The flow of water turns the generator.
-advantage: no greenhouse gases are produced
-disadvantage: expensive, can’t be built everywhere
•wave energy: generators are driven by the up and down motion of the waves at sea.
-advantage: does not produce greenhouse gases
-disadvantage: difficult to build
•geothermal resources: water is pumped down to hot rocks deep underground and rises as steam.
-advantage: no carbon dioxide is produced
-disadvantage: deep drilling is difficult and expensive
•nuclear fission: uranium atoms are split by shooting neutrons at them.
-advantage: produces a lot of energy from using very little resources
-disadvantage: producing radioactive waste
•solar cells: are made of materials that can deliver an electrical current when they absorb light energy •solar panels: absorb the energy and use it to heat water
-advantage: does not produce carbon dioxide
-disadvantage: variable amounts of sunshine in some countries
•Non-renewable source of energy: is exhaustible for example fossil fuels
•fuels can be burnt (or nuclear fuel can be forced to decay) in thermal power stations to transform the chemical energy stored to thermal energy which makes steam which turns turbines (kinetic energy) to produce electricity.
-advantage: cheap, plentiful, low-tech
-disadvantage: harmful wastes -produces greenhouse gases and pollutant gases, radiation...
•hydroelectric dams: river and rain water fill up a lake behind a dam. As water rushes down through the dam, it turns turbines which turn generators.
•tidal power scheme: a dam is built across a river where it meets the sea. The lake behind the dam fills when the tide comes in and empties when the tide goes out. The flow of water turns the generator.
-advantage: no greenhouse gases are produced
-disadvantage: expensive, can’t be built everywhere
•wave energy: generators are driven by the up and down motion of the waves at sea.
-advantage: does not produce greenhouse gases
-disadvantage: difficult to build
•geothermal resources: water is pumped down to hot rocks deep underground and rises as steam.
-advantage: no carbon dioxide is produced
-disadvantage: deep drilling is difficult and expensive
•nuclear fission: uranium atoms are split by shooting neutrons at them.
-advantage: produces a lot of energy from using very little resources
-disadvantage: producing radioactive waste
•solar cells: are made of materials that can deliver an electrical current when they absorb light energy •solar panels: absorb the energy and use it to heat water
-advantage: does not produce carbon dioxide
-disadvantage: variable amounts of sunshine in some countries
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