Question

find energy in kwh consumed in 10 hours by 4 devices of power 500w each

Answer 1

energy=power*time
=(500/1000)kw*10h
=5kwh.

for 4 devices=

5*4=20kwh.
:-)

Answer 2

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POWER =ENERGY / TIME

=ENERGY =POWERx TIME

=500 X 10^-3 x 10

=500 X 10^-2 KWh

for 4 divices
4 x 5 =20 kwh