Question

The rms value of a.c. voltage with peack of $311V$ is

• A. $220V$
• B. $311V$
• C. $180V$
• D. $320V$

Answer 1

The correct option is A $220V$

Peak value of a.c. voltage, $V_o=311$ volts

The rms value of voltage, $V_{rms}=\frac{V_o}{\sqrt{2}}$

$\therefore$ $V_{rms}=\frac{311}{\sqrt{2}}=\frac{311}{1.414}=220$ volts