Power: the Voltage and Power Ratings of a Particular Light

question 6

Multiple Choice

Power: The voltage and power ratings of a particular light bulb, which are its normal operating values, are 110 V and 60 W. Assume the resistance of the filament of the bulb is constant and is independent of operating conditions. If the light bulb is operated at a reduced voltage and the power drawn by the bulb is 36 W, what is the operating voltage of the bulb?

• A) 66 V
• B) 72 V
• C) 78 V
• D) 85 V
• E) 90 V

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