Question

an electric bulb is rated 10w what does it mean. what is energy cosumed in joules if it is used for 5 minutes?

Answer 1

power= E / T 
E = P x T = 10 x (5 x 60) = 10 x 300 = 3000 J
10w rating means it's power is 10 watts, i.e., it consumes energy at the rate of 10 joules per second

Answer 2

Given:

Power,

P = 10 W

Time,

t = 5 minutes

On converting Minutes into Seconds, we get

 = 300 seconds

To find:

Energy = ?

Solution:

As we know,

⇒  $Energy = Power\times Time$

On substituting the above given values, we get

⇒               $=10\times 300$

⇒               $=3000 \ Joule \ per \ sec$

Thus the consumed energy is "3000 Joule per sec".