# p1 - conservation and dissipation of energy

Conservation of energy
energy cannot be created or destroyed
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Dissipated energy/ dissipation of energy
the energy that is not usefully transferred and stored in less useful ways
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Efficiency
useful energy transferred by a device total energy supplied to the device
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Elastic potential energy
energy stored in an elastic object as a result of it being deformed. For example, a stretched spring
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Hooke's law
the extension of a spring is directly proportional to the force applied, as long as its limit of proportionality is not exceeded
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Input energy
energy supplied to a device
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Power
the energy transformed or transferred per second. The unit of power is the watt (w)
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Spring constant
force per unit extension of a spring
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Useful energy
energy transferred to where it is wanted in the way that it is wanted
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Wasted energy
energy that is not usually transferred
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Work
the energy transferred by a force. Work done (joules, J) = force (newtons, N) x distance moved in the direction of the force (metres, m)
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## Other cards in this set

### Card 2

#### Front

the energy that is not usefully transferred and stored in less useful ways

#### Back

Dissipated energy/ dissipation of energy

### Card 3

#### Front

useful energy transferred by a device total energy supplied to the device

### Card 4

#### Front

energy stored in an elastic object as a result of it being deformed. For example, a stretched spring

### Card 5

#### Front

the extension of a spring is directly proportional to the force applied, as long as its limit of proportionality is not exceeded