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If the reading of volmeter V(1) is 30 V,...

If the reading of volmeter `V_(1)` is 30 V, what is the reading of voltmeter `V_(2)` ?

Text Solution

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AC voltmeter reads rms value of voltage . RMS voltage
`applied = V_(0)/sqrt 2 = 40 V`
Reading of voltmeter `V_(2) is X , then V_(rms) = sqrt (V_(1)^(2) + V_(2))`
or `sqrt (X^(2) + 30^(2)) = 40 V implies X = 26.45 V`
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