Question

an electric heater of power 3 Kilowatt is used for 10 hour how much energy does it consume? express your answer in kilowatt hour and(2) joule

Answer 1

p = 3kw
t = 10h
e = p×t
= 30kwh

Answer 2

Power = 3 kW = 3000 W

Time = 10 h = 36000 s

${ \pink{ \bf{ P=E/T }}}$

${ \pink{ \bf{ E=P×T }}}$

E=3000×36000

E = 108000000J

${ \pink{ \bf{ In\: Joule \: = 1.08×10⁸J }}}$

1kWh = 3600000J

${ \pink{ \bf{ So, }}}$

108000000/3600000

${ \pink{ \bf{ In \: kWh \: =30kWh \: Ans }}}$