In this lesson, we will learn how to find power as a rate of energy conversion and efficiency as a ratio of useful work output to input for a system.
Sample Question Videos
Worksheet: 25 Questions • 2 Videos
Suppose you have a device that extracts energy from ocean breakers in direct proportion to their intensity. If the device produces 10.0 kW of power on a day when the breakers are 1.20 m high, how much will it produce when they are 0.600 m high?
What is the person’s useful power output?
How long will it take this person to lift kg of bricks to a 1.50-m-height platform?
For how long can you play tennis on the 800 kJ of energy in a candy bar, knowing that playing tennis consumes energy at a rate of 440 W? Give your answer in minutes.