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.

This

graphic gives information about how a hydroelectric

power

station

produces

electricity

.

Overall

, the hydroelectric

power

station

uses the potential energy of

water

flow from

high-level

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the high-level

show examples

reservoir

to the low-level one to generate

electricity

during day time

while

pumping

water

from the low-level

reservoir

back into the high-level one during the night. During the day, the

water

storage of the high-level

reservoir

will be introduced from a river and blocked by a dam which will intake the current towards the

power

station

established beside the low-level

reservoir

downstream. The

water

flow

then

drives turbines to generate

electricity

which is distributed to the national grid by

power

lines.

By contrast

, the

water

in the low-level

reservoir

will be pumped back to the high-level

reservoir

by the reversible turbines in the

power

station

during the night, and the dam will stop to intake the

water

at the same time. To summarise, the principle of how a hydroelectric

power

station

works is it utilizes the waterfall to drive generators to yield

electricity

during the day, and the

power

station

will pump the

water

back into the high-level

reservoir

at night.