P1.2 - Energy and efficiency

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  • Created by: Emily_O
  • Created on: 27-09-13 22:14

Conservation of energy

  • Energy can be transferred usefully, stored, or dissipated, but cannot be created or destroyed
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Useful and wasted energy

  • When energy is transferred only part of it may be usefully transferred, the rest is 'wasted'
  • Useful energy is energy in the place we want it and in the form we need it
  • Wasted energy is energy that is not useful energy
  • Wasted energy is eventually transferred to the surroundings, which become warmer. The wasted energy becomes increasingly spread out and so less useful
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Efficiency

Efficiency = useful energy out        (x100)

                         total energy in

Efficiency = total power out           (x100)

                          total power in

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