Answered: consume in 1 hour? J (b) A color…

consume in 1 hour? J (b) A color television set draws about 2.6 A when connected to 120 V. How much time is required for it to consume the same energy as the black-and-white model consumes in 1 hour?

College Physics

1st Edition

ISBN:9781938168000

Author:Paul Peter Urone, Roger Hinrichs

Publisher:Paul Peter Urone, Roger Hinrichs

Chapter20: Electric Current, Resistance, And Ohm's Law

Section: Chapter Questions

Problem 60PE: Integrated Concepts (a) What energy is dissipated by a lightning bolt having a 20,000-A current, a...

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Question

consume in 1 hour?
J
(b) A color television set draws about 2.6 A when
connected to 120 V. How much time is required for it
to consume the same energy as the black-and-white
model consumes in 1 hour?

Expert Solution

Step 1

Given:

The power supply to a typical black-white TV is P=92 W.
The voltage connected is V=120 V.

Part (a)

The time to consume electrical energy is t= 1 hr.

The expression for energy (U) is:

$U = P t$

Substitute all the known values in above equation.

$U = (92 W \times \frac{1 \frac{J}{s}}{1 W}) (1 hr× \frac{3600 s}{1 hr}) U = 331200 J$

Thus, the electrical energy consume in 1 hr is 331200 J.

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