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Q4
 
P
 = 
1.2kW
t
 = 
1h per day  (365.25h per year)
This assumes that the hours in a year is year is averaged out from the three years with 365 days and the fourth (leap year) with 366!)
 E
 (kWh)
 
 (kW)
 
 (h)

= 1.2kW x 365.25h = 438.3kWh


Cost per kWh
20p

therefore total cost 438.3kWh x 20p/kWh
= 8766p

= £87-66

LOJ Dec 2000
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