Chapter 18, Problem 40P

### College Physics

11th Edition
Raymond A. Serway + 1 other
ISBN: 9781305952300

Chapter
Section

### College Physics

11th Edition
Raymond A. Serway + 1 other
ISBN: 9781305952300
Textbook Problem

# A 1 150-W toaster and an 825-W microwave oven are connected in parallel to the same 20.0-A, 120-V circuit. (a) Find the toaster’s resistance R. (b) If the microwave fails and is replaced, what maximum power rating can be used without tripping the 20.0-A circuit breaker?

(a)

To determine
The toaster's resistance R.

Explanation

Given Info: Toasters power Ptoasters is 1150â€‰W Supplied voltage Î”V is 120â€‰V

Explanation:

Formula to calculate the toaster's resistance R is,

Ptoasters=(Î”V)2R

On rearrange

R=(Î”V)2Ptoasters

• Ptoasters is the toasters power

(b)

To determine
The maximum microwave power Pmicrowavemax rating can be used without tripping the 20.0-A circuit breaker.

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