In India,$AC$ voltage becomes zero how many times in $1$ $sec$?

The mean value of current for half cycle for a current variation shown by the graph is

The $AC$ voltage across a resistance can be measured using a

An alternating current at any instant is given by $i = [6 + \sqrt{56} \sin (100 \pi t + \frac{\pi}{3})] \ A$. The rms value of the current is . . . . . . . (in $A$)

The alternating current in a circuit is described by the graph shown in the figure. Calculate the root mean square $(I_{rms})$ current for this waveform.

If an $AC$ main supply is given to be $220\,V$,the average $emf$ during a positive half cycle will be.....$V$.