Question

A CD player uses 1,200 joules of energy in 60 seconds. What is the power rating of the CD player? 72,000 W 600 W 20 W 0.05 W

Answer 1

Answer: Option (c) is the correct answer.

Step-by-step explanation:

Power is defined at the amount of work done in per unit time.

Mathematically, P =
`(W)/(t)`

where P = power

W = work

t = time

Since, it is given that work or energy is 1,200 joules and time is 60 seconds. Therefore, calculate the power as follows.

P =
`(W)/(t)`

=
`(1200 joules)/(60 seconds)`

= 20 joules/second

or, = 20 Watt

Thus, we can conclude that the power rating of the CD player is 20 W.