Question

An electric heater of power 3kW is used for 10 hr. How much energy does it consume? Express your answer in (i) kWh (ii) joule​

Answer 1

Answer:

Energy consumed = power x time

(i) Energy = 3 kW × 10 h = 30 kWh

(ii) 1 kilowatt hour (kWh) =

3.6

×

10

6

J

30

k

W

h

=

30

×

3.6

×

10

6

J

=

1.08

×

10

8

J