The frequency of $AC$ mains in India is (in $\text{ Hz}$)

Both alternating current and direct current are measured in amperes. But how is the ampere defined for an alternating current?

If an alternating voltage is represented as $E = 141 \sin(628 t)$,then the rms value of the voltage and the frequency are respectively:

The $ rms $ value of current in a $ 50 \,Hz $ $ AC $ circuit is $ 6 \,A $. The average value of $ AC $ current over a complete cycle is:

$A$ sinusoidal voltage produced by an $AC$ generator at any instant $t$ is given by the equation $V = 311 \sin(314t)$. The $rms$ value of voltage and frequency are respectively:

Two sinusoidal voltages of the same frequency are shown in the diagram. What is the frequency and the phase relationship between the voltages? (Frequency in $Hz$ $\to$ Phase lead of $N$ over $M$ in radian)