The diagram below shows how electricity is generated in a hydroelectric power station. Summarise the information by selecting and reporting the main features, and make comparisons where relevant.

The diagram demonstrates how

electricity

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is produced in a hydroelectric

power

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station

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in

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during

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the

day

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and at

night

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.

The first step is

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to make sure

water

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in

river

Correct article usage

the river

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flow

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flows

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into the high-level reservoir which is blocked by a dam.

Then

Linking Words

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water

Add an article

the water

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flows to the

power

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station

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. There some reversible turbines are set up and they are connected to a generator, which is the core equipment to generate

electricity

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.

Then

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the generator turns the

water

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power

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into

electricity

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and it is conveyed by the powerlines to the national grid. The generating process of

electricity

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differs in the

day

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and at

night

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. In the

day

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, the

water

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naturally flows into the

power

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station

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while

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it is pumped back at

night

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instead

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. Meanwhile, during the

day

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, the

water

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which

go

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goes

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through the

power

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station

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flow

Correct subject-verb agreement

flows

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into the low-level reservoir directly, but it is pumped back into the high-level reservoir at

night

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.