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