Lesson: Power and Energy Physics • 9th Grade
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.
A 24 W fluorescent light is left on for several hours, during which time it is supplied with 432 kJ of energy. For how many hours was the light left on?
Which of the following is the correct unit for power?
A 250 W television and a 400 W television are both used for two hours. How much more energy does the 400 W television require to operate for this time than the 250 W television?