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Unit 10A World Energy Demand
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Unit 10: World EnergyLearning Aim, A: Investigate the present-day energy resources
Energy resources: Renewable
Solar energy
Wind energy
Biomass energy
Geothermal energy
Hydroelectric energy
Tidal energy
Wave energy
Energy resources: Non-Renewable
Coal
Nuclear energy
Oil
Natural gas
Solar energy: The sun’s heat and light energy are either turned into electrical energy by solar cells or
used to heat water for homes, using solar panels.
Wind energy: turn kinetic energy of wind into electrical energy. Used in poor countries.
Biomass energy: Trees absorb sun’s energy. Trees change this energy into chemical energy, which is
stored in themselves. When we burn wood, we turn energy into heat. Useful for cooking and
heating.
Geothermal energy: cold water pumped below ground. Hot rocks heat water turning into steam.
Steam generates electricity.
Hydroelectric energy: water in river has kinetic energy which is turned into electrical energy.
Tidal energy: hightide- trap water behind dam and the low tide uses water to release energy which is
used to generate electricity.
Wave energy: kinetic energy. Machines that bob up and down in waves. Energy turns electrical and
used in homes.
Coal: Produces electricity by burning coal in a boiler to produce steam. The steam which is produced
is then flown into a turbine which spins a generator to create electricity. The process repeats with
the steam being cooled, condensed back into the water, and returned to the boiler.
Oil: In conventional steam, the oil is burned to heat the water which creates steam to generate
electricity. In a combustion turbine, it is burned under pressure which produces hot exhaust gases
allowing the turbine to spin to create electricity.
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