P3 - Sustainable energy

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  • Created by: Megs555
  • Created on: 26-04-16 11:29

Energy Sources

Primary sources occur naturally:

  • fossil fuels
  • biofuel
  • waves
  • solar radiation
  • wind

Secondary sources are made from using a primary source:

  • electricity (can be generated from many primary sources.)
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Turning Generators Directly

Generators transfer kinetic energy into electrical energy.

Turning generators directly:

  • wind turbines
  • hydroelectric turbines
  • wave and tidal turbines

The turbine turns the generator and electricity is produced.

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Turning Generators Indirectly

Generators can be turned indirectly by using fossil or nuclear fuels.

Fossil fuels:

1. Heat is released form a primary energy source and boils the water to make steam.

2. The steam turns the turbine.

3. Turbine turns a generator and electricity is produced.

4. Electricity goes to the transformers to produce the correct voltage.

Nuclear power:

1. Uranium atoms split, releasing energy so the fuel becomes hot. This heats the water by turning it into steam.

2. The steam turns the turbine.

3. Turbine turns a generator and electricity is produced.

4. Electricity goes to the transformeers to produce the correct voltage.

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Electricity

Electricity is a secondary source because primary sources are used to produce it.

It can be either renewable or non-renewable.

It's very convinient because:

  • easily transmitted over distance (through cables).
  • can be used in may ways/for many things.
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How generators work

Electromagnetic Induction is a process where a conductor placed in a changing magnetic field causes the production of a voltage accross the conductor.

Move a magnet in and out of a coil. This causes voltage to be induced accross the ends of the coil. If the coil is part of a complete circuit a current will be induced. If this is done many times, an a.c current is generated.

This is not practical, so generators induce a current by spinning a magnet inside a wire.

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