Question

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

• A. 400 volts
• B. 323 volts
• C. 300 volts
• D. 340 volts

Answer 1

Answer: (C)

300 volts

Answer 2

Effective voltage

$V_{r.m.s.} = \frac{V_{o}}{\sqrt{2}} = \frac{423}{\sqrt{2}} = 300\mspace{6mu} V$