Useful energy

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    • Forms of energy
      • Chemical energy
      • Kinetic energy
      • Gravitational potential energy
      • Elastic potential energy
      • Electrical energy
      • Nuclear energy
    • Conservation of enrgy
      • Energy cannot be created or destroyed
      • Conservation of energy applies to all energy changes
    • 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 enrgy
      • Useful energy and wasted energy both end up being transferred to the surroundings, ehich become warmer
      • as energy spreadsout, it gets more and more difficult to use for further energy transfer
    • Energy and efficiency
      • The efficiency of the device = useful energy transferred by the device / total energy supplied to the device (x 100%)
      • No machine can be more than 100% efficent
      • Measures to make machines more efficient include reducing friction, air resistance, electrical resistance and noise due to vibration


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