Suppose that the voltage is reduced by 10 percent (to 90 vv). by what percentage is the power reduced? assume that the resistance remains constant.

The power is reduced by 19 percent.

Explanation:

The formula of power is given by:

In which V is the voltage, and R is the resistance.

I am going to use R = 1 in both cases.

With the original voltage, V = 1, we have

With the modified voltage, V = 0.9, we have:

So the power is reduced by 1-0.81 = 0.19 = 19 percent.

answer:

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