A bulb is rated 40W for a 220 V supply. The peak voltage of the supply is
Answer & explanation
Correct answer: option 3
The correct answer is Option (3) → $220\sqrt{2} V$
The Peak voltage ($V_{peak}$) is,
$V_{peak}=\sqrt{2}×V_{rms}$
$=220×\sqrt{2}=220\sqrt{2} V$