How many joules of energy are used by a 1.0-hp motor that runs for 1.0 hour? (1 hp = 746 W)

Question

Quizplus · Accepted Answer

First, we need to convert 1 hp to watts:
1 hp = 746 W

Now, we can calculate the energy used by the motor using the formula:

Energy = Power x Time

The power of the motor is 1.0 hp, or 746 W. The time it runs for is 1.0 hour, or 3600 seconds.

So, Energy = 746 W x 3600 s = 2685600 J

However, the question asks us to express the answer in joules, so we need to convert the answer to kilojoules:

Energy = 2685600 J = 2.69 MJ (rounded to two decimal places)

Therefore, the correct answer is B) 2.7 MJ.

How Many Joules of Energy Are Used by a 1