Lesson: Power and Energy

In this lesson, we will learn how to use the formula P = E/t to calculate the rate at which energy is transferred by a device given the amount of energy it transfers in a given time.

Video

08:56

Sample Question Videos

04:43
03:55

Worksheet: 17 Questions • 2 Videos

Q1:

Which of the following is the correct formula for the energy transferred, , in a given time, , for an electrical appliance with a given power, ?

Q2:

What is 50 MW in watts?

Q3:

A microwave is used for 5 minutes, during which time it is supplied with 180 kJ of energy. What is the power of the microwave?

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