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