Question

The rms voltage of domestic electricity supply is $220$ volt. Electrical appliances should be designed to withstand maximum instantaneous voltage of

• A. $220V$
• B. $310V$
• C. $330V$
• D. $440V$

Answer 1

Answer: (B)

$310V$

As we know,

Peak voltage

$V_0=V_{rms}\times \sqrt{2}$

$=\sqrt{2}\times 220=311V$