Question

A $120V,60Hz$ AC source is switched on. The voltage in it just after $1/720sec$ will be:

• A. $60$
• B. $120$
• C. $60\sqrt{2}$
• D. $120\sqrt{2}$

Answer 1

Answer: (A)

$60$

we know that $V=V_{max}sin\omega t$ Putting values we get $V=120sin(2\pi \times 60\times 1/720)$=> Doing all calculations we get $V=60Volts$