P1.3 Electrical Energy

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P1.3 Electrical Energy

The cost of electricity

  • The total amount of electrical energy transferred depends on the amount of time a device is switched on and its power rating
  • Power is measured in Watts (W) or kiloWatts (kW)
  • Energy is measured in Joules (J)


          Energy Transferred (kWh)= Power (kW)  X   Time (h)

          Cost (pence) = Energy Transferred (kWh) X Cost/Unit (pence)

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