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College Physics

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

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BuyFindarrow_forward

College Physics

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

What minimum number of 75-W light bulbs must be connected in parallel to a single 120-V household circuit to trip a 30.0-A circuit breaker?

To determine

To determine The number of light bulbs needed to trip a 30.0A circuit breaker

Explanation

Given Info: Output Power P  drawn by single bulb is 75W , Output Voltage V is 120V

Explanation:

Formula to calculate the current is,

P = IOne bulbV 

On Rearranging

IOne bulb=PV

    • P is the Electric Power
    • IOne bulb is the current in one bulb
    • V is the supplied voltage

Substitute 75W for P and 120V for V to find IOne bulb .

IOne bulb=75W120V           

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