An electric lamp is connected to $220 V, 50 Hz$ supply. Then the peak value of voltage is......$V$
$210$
$211$
$311$
$320$
The phase difference between the voltage and the current in an ac circuit is $\pi /4$. If the frequency is $50\, Hz$ then this phase difference will be equivalent to a time of
An alternating voltage $\mathrm{V}(\mathrm{t})=220 \sin 100 \ \pi \mathrm{t}$ volt is applied to a purely resistive load of $50\ \Omega$. The time taken for the current to rise from half of the peak value to the peak value is:
The peak value of $220 \,volts$ of $ac$ mains is......$volts$
In alternating current circuits, the $a.c$. meters measure
Which of the following units denotes the dimension $\frac{{M{L^2}}}{{{Q^2}}}$ where $Q$ denotes the electric charge?