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?

The voltage operating is the 85,20563362

Explanation:

Power is the relation between Voltage and Current so knowing the resistance is going to be constant the equation of power can be just replacing in voltage terms:

1.

using also Law OHM

2.

Replacing 2 in the equation 1 so all the data are going to be in Voltage terms:

1.

 ⇒

Ω

So the resistance is constant so the current is going to be the same at the other Power 36 W:

⇒

d is the correct answer

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