Question

72 joules of energy are delivered to a load in one hour. what is the average power? enter your answer in mw rounded to the nearest integer.

Answer 1

20 mW

Step-by-step explanation:

You want to know the average power in milliwatts represented by 72 J per hour.

Unit conversion

1 J/s = 1 W

`\frac{72\text{ J}}{1\text{ h}}=\frac{72\text{ J}}{1\text{ h}}*\frac{1\text{ h}}{3600\text{ s}}*\frac{1\text{ W}}{1\frac{\text{J}}{\text{s}}}*\frac{1000\text{ mW}}{1\text{ W}}=(72*1000)/(3600)\text{mW}\\\\=\boxed{20\text{ mW}}`