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Q5
 
P
 = 
750W
(0.75kW)
t
 = 
10 minutes per day is 10/60 (or 1/6) hours per day (1/6 x 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)

= 0.75kW x 365.25 h = 45.66 kWh
6


Cost per kWh
21p

therefore total cost 45.65625kWh x 21p/kWh
= 958.8p
= 959p (rounding to the nearest penny)
= £9.59

LOJ Dec 2000
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