How is current produced using a coil of wire and a magnet?
Either or both have to move; if neither move, no current is produced; the more turns the wire the stronger the magnet; the faster the magnet the larger the current.
Fast growing plants can be burnt to release energy. Heats water, produces steam, which turns turbines, which turns generators.
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Fossil Fuels
Fuels can be burnt to release energy, heat water to produce steam, which turns turbines, which turns generators.
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Nuclear Power
Fission of uranium releases energy, heats water to produce steam, which turns turbines, which turns generators.
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Wind Power
The wind turns turbines, which turns generators.
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Wave Power
Bobbing 'ducks', turn turbines, which turn generators.
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Tidal Power
Tidal pens trap water at high tides, at low tides it flows out, which turns turbines, which turns generators.
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Hydroelectric Power
Water is trapped behind the dam and released down a pipe, which turns turbines, which turns generators.
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Geothermal Energy
Water is pumped underground and comes back up as steam, which turns turbines, which turns generators.
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Solar Power
Photovoltaic cells change light energy to electrical energy.
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biomass/biofuels ad/dis:
renewable, reliable; produces polluting gas CO2 (but carbon neutral), large amounts of land needed to grow
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fossil fuels ad/dis:
reliable, low building cost; un-renewable, gives out CO2 (creates greenhouse effect), gives out sulphur dioxide - dissolves in rain to make acid rain
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nuclear power ad/dis:
reliable, no polluting gases, a lot of energy from little fuel; high building cost, un-renewable, toxic radioactive waste - difficult and expensive to dispose of
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wind power ad/dis:
renewable, no polluting gases; unreliable, high building cost, kills birds, noise and visual pollution
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wave power ad/dis:
renewable, no polluting gases; unreliable, only generated near the coast
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tidal power ad/dis:
reliable, renewable, no polluting gases; high building cost, destroys and floods coat-lines to build, only generated near coast-lines
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hydroelectric power ad/dis:
reliable - if reservoir goes dry can't be produced, renewable, no polluting gases; high building cost, floods valleys, disputes over water in different countries
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solar power ad/dis:
renewable, no polluting gases; un-renewable, high building cost
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geothermal energy ad/dis:
reliable, renewable, no polluting gases; only generated in areas where the Earth's crust is very thin, high building cost
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