Hydroelectric Energy

Are located in hilly areas where dams can be built and large water reservoir can be obtained.

• Hydroelectric power station
• Nuclear power station
• Gas turbine power station
• Steam power station 

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The water turbine drives the generator which converts  ................

• The mechanical energy to electrical energy
• The electrical energy to electrical energy
• None

The advantage of hydroelectric power station.

• It has the lowest running cost
• Simple in design and construction
• Very small running operation cost

The disadvantage of hydroelectric power station.

• The highest initial cost compared to other types of plant.
• It involve high capital cost due to construction of dam. 
• There is a problem in starting the unit.
• The overall efficiency is low (20%).

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Water stored behind the dam is known as …………..

• Dam
• Penstock
• Water reservoir
• Spillway

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Take the water from reservoir to water turbine.

• Dam
• Penstock
• Surge tank
• Spillway

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Used to increase the height of water level.

• Dam
• Penstock
• Water reservoir
• Spillway

What is a generator?

• A machine that creates radiation.

• A machine that converts one energy source into electrical energy.

• Only works with renewable energy.

• Only works with fossil fuels.

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What is one one disadvantage of hydroelectric energy?

• It doesn't work if you don't have volcanoes nearby.

• It doesn't work if it is not windy.

• It doesn't work if you don't have rivers or moving water nearby.

• It doesn't work unless you have plenty of fossil fuels.

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An advantage of hydroelectric power station.

• It produces thermal pollution

• Only a few dams have been built

• They produce no carbon dioxide when making electricity

• They are cheap to build

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