Question

what is the operating resistance of a 100- watt household light bulb? the operating line voltage of household electriciry is 120v? ​

Answer 1

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given:

P=100W

v=120v

R=?

from P=V^2/R

WE HAVE

R=V^2/P

=(120V)^2/100W

=144 ohm

Answer 2

Answer:

about 9.5 ohms

The typical cold resistance of a 100 W incandescent lamp is about 9.5 ohms. If that resistance stayed the same with 120 V applied, Ohm's Law tells us that the bulb would draw about 12.5 amps and dissipate about 1,500 Watts