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 o

Question

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. 78 V
b. 72 V
c. 66 V
d. 90 V
e. 85 V

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Sapo 3 years 2021-08-14T17:08:21+00:00 1 Answers 57 views 0

Answers ( )

  1. bonexptip
    0
    2021-08-14T17:09:23+00:00
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    Answer:

    c. 66 V

    Explanation:

    p =IV

    I =P/V

    P1/V1=P2/V2

    60/110=36/V2

    0.55 = 36/V2

    V2 =36/0.55 = 65.5V

    V2 = 66V

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