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

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 relation.

Why is $220 \ V$ $AC$ more dangerous than $220 \ V$ $DC$?

$A$ $40 \ \Omega$ electric heater is connected to a $200 \ V, 50 \ Hz$ mains supply. The peak value of electric current flowing in the circuit is approximately......$A$

The peak value of an alternating current is $6 \ A$. What is the root mean square (r.m.s.) value of the current?

Alternating voltage: