A generator produces a voltage that is given by $V = 240\,sin \,120\,t$, where t is in seconds. The frequency and $ r.m.s.$ voltage are
$60 Hz and 240 V $
$19 Hz and 120 V$
$19 Hz and 170 V$
$754 Hz and 70 V$
The root mean square value of the alternating current is equal to
The $ r.m.s$. value of an ac of $ 50 Hz$ is $10 amp$. The time taken by the alternating current in reaching from zero to maximum value and the peak value of current will be
The maximum value of $a.c.$ voltage in a circuit is $707V$. Its rms value is.....$V$
The average value of potential difference $V$ shown in figure is
Both alternating current and direct current are measured in amperes. But how is the ampere defined for an alternating current ?