Question

Question 20 Find the energy in kW h consumed in 10 hours by four devices of power 500 W each.

Class 9 - Science - Work and Energy Page 159

Answer 1

P = 500 W = 0.50 kW

T = 10 h

Energy consumed = P x T

=> Energy consumed = 0.50 x 10
                               
                                  = 5 kWh

Hence, the energy consumed in 10 hours by four devices of power 500 W each = 5 x 4 = 20 kWh

Answer 2

Hi !

Power = P = 500 W = 0.50 kW

Time = t = 10 h

Energy consumed = P x t

Energy consumed = 0.50 x 10

= 5 kWh

Energy consumed in 10 hours [by four devices of power 500 W each ]
= 5 x 4
= 20 kWh