By: Eric R., Bree, Lauren, and Ariel

Introduction• Used as energy for

– Homes– Schools– Businesses

• Why do they use it?– Renewable resource– Almost free– No waste– Doesn’t pollute the air

How it is used todayUsed as electricitySupplies 10% of the

world’s electricityMore people are

using water powerDue to the

decreasing amount of fossil fuels

The water cycle

• Solar energy heats on the surface causing the water to evaporate

• This water vapor condenses into clouds and falls back into the surface as precipitation.

• The water flows through rivers back into the oceans, where it can evaporate and begin the cycle over again.

How water generates powerA dam is built to trap water

usually in a valley where there is an existing lake

Water is allowed to flow through tunnels in the dam, to turn turbine to drive generators.

the dam is much thicker at the bottom than at the top, the pressure of the water increases with depth.

Hydro-electric power stations can produce a great deal of power very cheaply.