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
$2 \times 10^{-2}\,sec$ and $14.14\,amp$
$1 \times 10^{-2}\,sec$ and $7.07\,amp$
$5 \times 10^{-3}\,sec$ and $7.07\,amp$
$5 \times 10^{-3}\,sec$ and $14.14\,amp$
An alternating current is given by the equation $i = {i_1}\cos \,\omega \,t + {i_2}\sin \omega \,t$. The r.m.s. current is given by
The power is transmitted from a power house on high voltage $ac$ because
A alternating current at any instant is given by $i=\left[6+\sqrt{56} \sin \left(100 \pi t+\frac{\pi}{3}\right)\right] A$. The rms value of the current is_________.A.
The current flowing through an ac circuit is given by
$I=5 \sin (120 \pi t) A$
How long will the current take to reach the peak value starting from zero?
A resistance of $40 \,\Omega$ is connected to a source of alternating current rated $220\, V , 50 Hz$. Find the time taken by the current to change from its maximum value to $ms$ value