The mean value of current for half cycle for a current variation shown by the graph is
$\frac{i_0}{2}$
$i_0$
$\frac{i_0}{\sqrt{3}}$
$\frac{i_0}{3}$
In an ac circuit, peak value of voltage is $423\, volts$. Its effective voltage is .......... $volts$
If $I_1, I_2, I_3$ and $I_4$ are the respective $r.m.s$. values of the time varying currents as shown in the four cases $I, II, III$ and $IV$. Then identify the correct relations.
The alternating current is given by
${i}=\left\{\sqrt{42} \sin \left(\frac{2 \pi}{{T}} {t}\right)+10\right\} {A}$
The $r.m.s.$ value of this current is ${A}$
In $ac$ circuit when $ac$ ammeter is connected it reads $i$ current if a student uses $dc$ ammeter in place of $ac$ ammeter the reading in the $dc$ ammeter will be:
The root mean square value of the alternating current is equal to