physics unit 1- electrical energy

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  • electrical appliances transfer electrical energy into whatever form needed by a switch e.g. light switch = ELECTRICAL--->LIGHT
  • energy is often wasted by heating e.g. in a tv 
  • appliances have been designed to waste as little energy as posisble
  • power- the rate at which an appliance transfers energy
  • power is measured in watts
  • 1watt transfers 1 joule of energy ever second
  • 1 kilowatt= 1000 watts
  • power=energy/time
  • efficiency=useful power out/total power in X 100
  • kilowatt

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