Question

When 20. joules of work are done in 4.0 seconds; what is the power developed?

A. 0.20 watt

B. 5.0 watts

C. 16 watts

D. 80. watts

Answer 1

to find:

the power developed when, 20 joules of work are done in 4.0 second.

solution:

power= workdone/ time

here workdone= 20 joules

time taken= 4.0s

so putting these values in the above formula, we get:

power= 20/4.0

=5.0 watts

answer= option b) 5.0 watts

Answer 2

$\bold\blue{Formula : }$

$\bold{Power = \frac{energy}{time} }$

$\bold\blue{Given : }$

• Joules of work = 20

• work are done = 4.0 seconds

$\bold\blue{ Solution : }$

$\bold{Power = \frac{energy}{time} }$

$\bold{Power = \frac{20}{4.0} }$

$\bold{ Power = 5.0}$

So , B.) 5.0 watts is answer .