P1.6

• Energy efficiency


  about getting as much useful energy as possible from a device
• Efficiency Equation


  Useful energy/total energy supplied in (x100)
• Efficiency of a device


  the proportion of the energy supplied that is transferred in useful ways
• The greater the percentage of useful energy, the more efficient the device is
• Useful Energy


  Energy in the place we want it and in the form we need it
• Different types of energy can be converted into different forms of energy.
• Efficiency can be calculated by dividing the useful energy output by the total input energy and multiplying it by 100.
• When converting one type of energy to another some energy will always be lost due to friction or other resistances.
• What is waste energy?

  The energy used by the device not for its desired purpose.