Question

Find the energy in kWh consumed in 10 hrs by four devices of power 500 W each

Answer 1

No. of devices = 4

Time = 10h

Power = 500w each
 

Energy = No. of devices X Time X Power

             =  4 X 10h X 500w

             =  20000wh

             =  20000/1000 = 20 Kwh 

Answer 2

Hey there!

Given,

Power ( P) = 500 W =0.50 kW

Time (t) = 10 h

We know,

Work done = Energy consumed.

Power = work done / time

0.50 = Energy consumed / 10

Energy consumed  = 0.50 * 10 = 5 kWh

Now,

Energy consumed by four devices = 4 * 5 = 20 kWh.

Good day!