Physics- Using energy

Using energy

Using energy

Forms of energy

  • Energy exists in different forms
  • Energy can be transferred from one form into another form
  • When an pnbject falls and gains speed, its gravitational poential energy decreases and its kinetic energy increases 
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Using energy

Conservation of energy

  • Energy can be transferred from one form to another, or from one place to another
  • Energy cannont be created or destroyed 
  • Conservation of energy applies to all energy changes
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Using energy

Useful energy

  • Useful energy is energy in the place we want it and the form we need it
  • Wasted energy is energy that is not useful energy
  • Useful energy and wasted energy both end up being transferred to the surroundings, which become warmer
  • As energy spreads out, it gets more and more difficult to use for further energy transfers
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Using energy

Energy and efficiency

  • The efficiency of an appliance= useful energy transferred by the appliance/ total energy supplied to the appliance (x100%)
  • No machine can be more than 100% efficient
  • Measures to make machines more efficient include reducing: 
  • Friction
  • Air resistance
  • Electrical resistance
  • Noise due to vibrations
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