The peak value of an alternating current in a 1500-W device is 6.4 A. What is the rms voltage across it

6787.5 V

Explanation:

From the question,

P = IV Equation 1

Where P = Power, I = rms current, V = rms voltage.

make V the subject of the equation

V = P/I Equation 2

Given: P = 1500 W, I = 6.4/√2 = 4.525 A

Substitute these values into equation 2

V = 1500(4.525)

V = 6787.5 V

Hence the rms voltage = 6787.5 V

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