Answered: LED lamp rated 9 W is on for 30 minutes…

LED lamp rated 9 W is on for 30 minutes and TV of 60 W is on for 2.5 hours. How much energy has been used? a. 68 Wh b. 360 Wh c. 420 Wh

Delmar's Standard Textbook Of Electricity

7th Edition

ISBN:9781337900348

Author:Stephen L. Herman

Publisher:Stephen L. Herman

Chapter25: Surge, Spike, And Lightning Protection

Section: Chapter Questions

Problem 4RQ: If a voltage spike lasts for 1.5 nanoseconds, what is the frequency of the spike?

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Concept explainers

Electrical Heating Unit

The conversion of electrical energy to heat energy is known as electric heating. The heating system that converts the electrical energy to heat energy for various application is called electrical heating unit. Electricity is employed as the firing mechanism in electric heating systems, which transforms electric current to heat. Electric heaters have heating elements in the form of electric resistors.

Question

LED lamp rated 9 W is on for 30 minutes and TV
of 60 W is on for 2.5 hours. How much energy
has been used?
a. 68 Wh
b. 360 Wh
c. 420 Wh
d. 960 Wh

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