Question

You do 45 J of work in 3.0 seconds. How much power do you use?

Answer 1

Answer:

we know that energy=power*time

so,power=energy/time

so,power=45/3=15

so,power is 15 watts

Answer 2

Given:

The energy consumed for a work to be done = $45$ J

The time taken for the work done = $3$ seconds

To find:

The power is used for the work done.

Formula:

$P\;=\;\frac Et$

where

$P$ is the power

$E$ is the energy in Joule

$t$ is the time in seconds

Explanation:

$P\;=\;\frac Et$

$P\;=\;\frac{45}{3}$

$P\;=\;15\;W$

Answer:

The power used is $15\;W$