The diagrams below show two methods of using water to produce electricity. Summarise the information by selecting and reporting the main features, and make comparisons where relevant. Hydroelectric dam

The diagrams show two different ways in which

water

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can be used to produce

electricity

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. In both diagrams,

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water

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the water

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turns a turbine and a

spindle

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, which powers a

generator

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.

However

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, the way in which

this

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is done is slightly different in each case. In the hydroelectric dam, the process begins when a gate in the dam is opened to allow

water

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from a reservoir to enter and flow down a passage called a penstock. The

water

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turns the turbine and the

spindle

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, and the

spindle

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rotates in the

generator

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to produce

electricity

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.

This

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is distributed to power lines. In the wave-air

generator

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, there are two chambers, a lower

chamber

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and an upper

chamber

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. Waves enter the lower

chamber

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, and the turbine and

spindle

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in the upper

chamber

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are turned by air which rises from the lower

chamber

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. As with the hydroelectric dam, the

spindle

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then

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produces

electricity

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in the

generator

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.

Instead

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of being sent to power lines,

however

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, the

electricity

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is sent directly to a lighthouse or buoys. These diagrams show how

water

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can produce

electricity

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in just a few simple steps.