The filament in an incandescent light bulb is a resistor that has a resistance o

Question

The filament in an incandescent light bulb is a resistor that has a resistance of 8.5 at room temperature.

Part A

By what factor does the resistance increase when a 75-W bulb connected to a 120-V power source is turned on and heats up?

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The filament in an incandescent light bulb is a resistor that has a resistance of 8.5 at room temperature.

Part A

By what factor does the resistance increase when a 75-W bulb connected to a 120-V power source is turned on and heats up?

15

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Incorrect; Try Again; 5 attempts remaining

Explanation / Answer

P = power = 75 Watt

V = voltage = 120 volts

R = V2/P = 1202/75 = 192 ohm

Rorginal = 8.5 ohm

factor = R/Roriginal = 192 / 8.5 = 22.6

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