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Chapter 32: Q. 62 (page 926)

Lightbulbs labeled 40W,60Wand 100W are connected to a120V/60Hzpower line as shown in the figure .What is the rate at which energy is dissipated in each bulb?

Short Answer

Expert verified

The rate at which energy is dissipated in each bulb is

I=0.2A,P1=14.4W,P2=9.6W

Step by step solution

01

Given Information

We have been given that light bulbs of 40W,60Wand100Ware connected to a 120V/60Hzpowerline and we have to find the rate at which energy is dissipated in each bulb.

02

Simplification

For the bulb of 40W:

P1=V2R1

For the 60Wbulb:

P2=V2R2

R2=240惟

The total resistance is:

600ohm

The power dissipation in 40Wbulb is:

Pdis1=14.4W

The power dissipation in bulb is:

Pdis2=9.6W

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