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 please give correct answer​

Answer 1

Answer:

1. 30 kWh

2.30 joules

Explanation:

Energy=power*time

=3*10

=30

Answer 2

Power = 3 kW = 3000 W

Time = 10 h = 36000 s

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

${ \orange{ \bf{ E=P×T }}}$

E=3000×36000

E = 108000000J

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

1kWh = 3600000J

${ \orange{ \bf{ So, }}}$

108000000/3600000

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