The peak value of an alternating e.m.f. E is given by $E = {E_0}\cos \omega \,t$ is $10\, volts$ and its frequency is $50\; Hz$. At time$t = \frac{1}{{600}}\;sec$, the instantaneous e.m.f. is
$10\,V$
$5\sqrt 3 \,V$
$5 \,V$
$1\, V$
A direct current of $5\,A$ is superposed on an alternating current $I =10 \sin \omega t$ flowing through the wire. The effective value of the resulting current will be
What are $AC$ voltage ? Write the equation for $ac$ voltage.
A periodic voltage $V$ varies with time $t$ as shown in the figure. $T$ is the time period. The $r.m.s$. value of the voltage is :-
Which of the following components of a $LCR$ circuit, with $ac$ supply, dissipates energy
Both alternating current and direct current are measured in amperes. But how is the ampere defined for an alternating current ?