If instantaneous current is given by $i = 4\cos \,(\omega \,t + \phi )$ amperes, then the $r.m.s$. value of current is

The peak value of $220 \,volts$ of $ac$ mains is......$volts$

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

In the given $A.C.$ circuit, the instantaneous current through inductor and capacitor are $0.8 \,A$ and $0.4 \,A$ respectively. The instantaneous current through resistor is ........ 

In given circuit, voltage across the inductor will be .....$V$

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 ${A}$