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Cyber-chess a chess instruction site
Q2
                                                                                         
P
 = 
2.5kW
t
 = 
30 mins
(0.5h)
 E
= 
P 
x 
t 
 (kWh)
 
 (kW)
 
 (h)

= 2.5kW x 0.5h = 1.25kWh

Cost per kWh
= 
24p

therefore total cost 1.25kWh x 24p/kWh = 30p

LOJ Dec 2000