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Chapter 19: Q23Q (page 796)

A desk lamp that plugs into a wall socket can use a or a light bulb. Which bulb has the larger resistance? Explain briefly.

Short Answer

Expert verified

The bulb has the larger resistance.

Step by step solution

01

Given data

Input voltage:

V=120V

Output power of first bulb:

P1=60W

Output power of second bulb:

P2=100W

02

Resistance of a bulb

The resistance of a bulb of wattage when connected to an input voltage is

R=V2P

03

Determination of resistances of the two bulbs

From the above equation, the resistance of the first bulb is:

R1=V2P1=120V260W=240.1V2/W脳1惟1V2/W=240惟

From the above equation, the resistance of the second bulb is:

R2=V2P2=120V2100W=144.1V2/W脳1惟1V2/W=144惟

Thus, the first bulb has the larger resistance.

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