Question

An electric bulb is rated 40 watt. What does it mean, what is the energy consumed in joules if it is used for 100 min.

Answer 1

it means that it conduct 40 watt electricity for a time 
and it used 4000watt electricity

Answer 2

Answer:

Watt is S.I. unit of Power

So 40 W is Power

Explanation:

Energy =Power×Time

=40×100

=4000J