Question

A generator produces a time varying voltage given by $V=240\sin 120t$, where $t$ is in second. The rms voltage and frequency are

• A. $170V$ and $19Hz$
• B. $240V$ and $60Hz$
• C. $170V$ and $60Hz$
• D. $120V$ and $19Hz$

Answer 1

The correct option is A $170V$ and $19Hz$

$V_0=240V$
$\therefore V_{rms}=\frac{V_0}{\sqrt{2}}=\frac{240}{\sqrt{2}}=170V$
$\omega =120$ rad/s
$f=\frac{\omega }{2\pi }=\frac{120}{2\times 3.14}=19Hz$