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Card 6

Front

generate electric currents directly from sunlight. The best source of energy for watches and calculators.

Back

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Card 7

Front

requires the flooding of a valley by building a big dam.

Back

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Card 8

Front

spare nightime electricity used to pump water up to a higher reservoir.

Back

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Card 9

Front

as waves come to the shore they provide an up and down motion which can be used to drive the generator.

Back

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Card 10

Front

as the tide comes in it fills up an estuary to a height of several metres.

Back

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Card 11

Front

it also drives the turbines.

Back

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Card 12

Front

only possible in volcanic area where hot rocks lie quite near the surface.

Back

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Card 13

Front

source of geothermal energy

Back

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Card 14

Front

takes electricity from power stations to where it is needed in homes and industry.

Back

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Card 15

Front

parts of the national grid.

Back

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