Kaplan 10th Edition DT Q39

Kaplan's Book

39) This question asks us to find the energy used in three minutes by a 2,400-watt microwave. This question requires us to recognize the different units and their relationship. The first thing we need to know is that the watt is the unit for power. Next, let's look at the power equation.

Where P is power, W is work, and t is time

The problem asks us to find the energy the microwave uses; this is also known as the work. We want the work done in three minutes, so we can convert three minutes to seconds and solve for work.

Where P is power, W is work, and t is time

Answer: A