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Cyber-chess a chess instruction site
Q1
                                                                                             
P
 = 
3kW
t
 = 
3h
 E
= 
P 
x 
t 
 (kWh)
 
 (kW)
 
 (h)

= 3kW x 3h = 9kWh


Cost per kWh
= 
20p

therefore total cost 9kWh x 20p/kWh = 180p = £1-80

LOJ Dec 2000