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Energy and energy conversions

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by

Harvey Buckle

on 22 November 2017

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Transcript of Energy and energy conversions

Aim
To know the various forms of energy
To know how they can be interconverted
To address efficiency
Starter
Swap seats
Energy stores
kinetic energy
internal energy
elastic potential energy
gravitational potential energy
electrical energy
magnetic energy

Energy and energy conversions
22nd November 2017
Kinetic energy
Moving things have kinetic energy. The more mass a thing has and the faster it moves, the more kinetic energy it has. All moving things have kinetic energy, even very large things like planets, and very small ones like atoms.
Gravitational
When an object is moved higher, it gains gravitational potential energy. The amount of energy it gains depends upon:
the mass of the object
the extra height it gains
the gravitational field strength
Elastic potential
Some objects can change shape reversibly. Rubber balls, springs and elastic bands are like this. When a rubber ball is stretched or squashed, it can regain its shape again. Elastic potential energy is stored in stretched or squashed materials.
Electrical and magnetic
Electrical energy

Some objects carry electrical charges and create electric fields. These charged objects can exert forces on each other. You get an electric current when charged particles move through a wire.
Magnetic energy

Some objects can be magnetised and create magnetic fields. They can exert forces on other magnetised objects, or on magnetic materials.
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