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College Physics

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

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Section
BuyFindarrow_forward

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 1150W Supplied voltage ΔV is 120V

Explanation:

Formula to calculate the toaster's resistance R is,

Ptoasters=(ΔV)2R

On rearrange

R=(ΔV)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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