P1.3 Electrical energy

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  • P1.3 Electrical energy
    • Electrical appliances
      • Transfer electrical energy into useful energy
    • Power
      • rate of transfer of energy
        • 1 watt= 1 joule per second
        • 1 kilowatt = 1000 watts
      • P = E / t
    • Using electrical energy
      • 1 kilowatt hour
        • = energy supplied to a 1 kW appliance in 1 hour
      • total cos = number of kWh used x cost per kWh
    • Cost effectiveness
      • Getting the best value for money
      • compare cost to buy, running cost and other

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