Physics P1 4.2 Energy from wind and water.

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What is a wind turbine?
An electricity generator on top of a tall tower.
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How can waves generate electricity?
By turning a floating generator.
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How do hydroelectricity generators work?
They are turned by water running downhill.
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How dos a tidal power station work?
It traps each high tide and uses it to turn generators.
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What is energy from wind, waves and tides called and why?
Renewable energy vacates these sources of energy can never be used up, unlike fossil fuels or nuclear fuels.
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How can wind energy be used?
To drive turbines directly, in a wind turbine the wind passing over the blades makes them rotate and drive a generator at the top of a narrow tower.
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How can water produce electricity?
Electricity can be produced from energy obtained from falling water, waves or tides.
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What is hydroelectric power?
At a hydroelectric power station, water is collected in a reservoir, this water is allowed to flow downhill and turn turbines at the bottom of the hill.
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What happens to water in a pumped storage system?
Surplus electricity is used at times of low demand to pump the water up the hill to the top reservoir, the energy is stored until times of high demand then water can be released to fall through turbines and transfer stored energy to electrical energy
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What is wave power?
The movement of waves on the sea is used to generate electricity, by driving a floating turbine that turns a generator, the electricity is then delivered to the grid system on shore by a cable.
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What is tidal power?
Sea levels around the coastline rise and fall twice daily (tides). If a barrage is built across a river estuary, the water at each high tide can be trapped behind it and wen the water is released to fall to the lower sea level it drives turbines.
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What form of energy is stored in the water in the top reservoir of a pumped storage scheme?
Gravitational potential energy.
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Why is wave power likely to be less reliable than tidal power?
There are always two ties a day (tides depend on the gravitational pull of the Sum and Moon) but on a calm day there may not be many waves (waves depend on the winds, which are unreliable).
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**THERE ARE A NUMBER OF DIFFERENT WAYS THAT ELECTRICITY CAN BE GENERATED USING ENERGY FROM WATER**
**MAKE SURE YOU UNDERSTAND THEM AND CAN DESCRIBE THE DIFFERENCES BETWEEN THEM**
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Other cards in this set

Card 2

Front

How can waves generate electricity?

Back

By turning a floating generator.

Card 3

Front

How do hydroelectricity generators work?

Back

Preview of the front of card 3

Card 4

Front

How dos a tidal power station work?

Back

Preview of the front of card 4

Card 5

Front

What is energy from wind, waves and tides called and why?

Back

Preview of the front of card 5
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