First slide

Alternating Current and voltage

Question

In an ac circuit, peak value of voltage is 423 volts. Its effective voltage is

Moderate

A

400 volts
B

323 volts
C

300 volts
D

340 volts

Solution

Effective voltage $V_{r . m . s .} = \frac{V_{o}}{\sqrt{2}} = \frac{423}{\sqrt{2}} = 300 V$

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