The diagrams show a structure that is used to generate electricity from wave power. Summarise the information by selecting and reporting the main features, and make comparisons where relevant.

The two diagrams show how

electricity

can be generated by the rise and fall of

water

caused by sea waves. The process involves a structure which is mounted on the side of a cliff or sea wall.

This

structure consists of a large chamber. One end is open to the sea, and the other leads into a vertical

column

, which is open to the atmosphere. A

turbine

is installed inside

this

column

and

this

is used to generate the

electricity

in two phases. The first diagram indicates that when a wave approaches the device,

water

is forced into the chamber, applying pressure on the

air

within the

column

.

This

air

escapes to

atmosphere

Correct article usage

the atmosphere

show examples

through the

turbine

, thereby producing

electricity

. The

second

diagram illustrates the

next

part of the process when a wave retreats. As the

water

level falls, the

air

from outside the

column

is sucked back through the

turbine

.

As a result

,

electricity

continues to be generated. The

turbine

rotates only in one direction, regardless of the direction of the

air flow

Correct your spelling

airflow

show examples

. In conclusion, we can see that

this

structure is useful as

electricity

is generated in both phases: entering and retreating of

water

.