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.

The diagrams given demonstrate two different ways to produce electricity using a water source.

Overall

, both methods use renewable resources but there are differences in locations and operation ways. Having looked at the first picture provided,

it is clear that

the hydroelectric dam uses water stored at the reservoir as energy. The process begins when the gate opens to let it in. After that, the width and angle of the penstock increase its speed which turns the turbine and spindle so that the electric power is created.

Finally

, electricity is distributed to power lines and the liquid is discharged into the river which ends the process. The second method is the wave-air generator. Different from the mentioned approach,

this

one takes its energy from ocean waves. Relating to the process, when waves enter the lower chamber, the air is pushed up into the upper chamber which turns the turbine and spindle.

Then

, the power is generated and the air escapes from the upper chamber.