Electrical Energy

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    • Electrical appliances
      • Electrical appliances cam transfer electrical energy into useful energy at the flick of a switch
      • Uses of everyday electrical appliances included heating, lighting, making objects move and creating sound and visual images
      • An electrical appliance is designed for a particular purpose and should waste as little enrgyas possible
    • Electrical power
      • Power is rate of transfer of energy
      • P=E/T
      • Efficiency= useful power in/ total power out (x100%)
    • Using electrical power
      • The kilowatt-hour is the energy supplied to a 1KW appliance in 1 hour
      • E=P x T
      • Total cost= number of KWH used x cost per KWH
    • Cost effectiveness matters
      • To compare the cost effectiveness of different appliances, we need to take account of the costs to buy it, running costs and other costs such as environmental costs
      • Cost effectiveness means getting the best value  for money


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