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The cost of electricity (ANSWERS)
A1.
  1. kWh
  2. Power (kW) x time (h) = Energy (kWh)
  3. 0.014 units
  4. 1.6 units
  5. 71h for Sally; 0.6h (37 minutes) for Lucy
  6. If a Unit of electricity costs 21.52p how much would it cost per week for
    1. 40p
    2. 20p

A2.

 

  1. £94.32.
  2. £1-56
  3. Cost of sensor would be recouped in two years. In the long term it would be a good idea. Care for the environment/reducing global warming.