Power

• What is the definition of ‘Power’?

  The rate at which energy is transferred/work is done
• Power = energy transferred/time


  Power = work done/time
• What is the unit for power?

  Watt (W)
• What is one Watt equivalent to?

  1 Joule per second
• What is efficiency?

  The proportion of energy that is converted usefully, rather than water/dissipated
• How do you calculate efficiency?

  Efficiency = useful energy out/total energy in