A direct current of $10 \,A$ is superimposed on an alternating current $I=40 \cos \omega t\;( A )$ flowing through a wire. The effective value of the resulting current will be ....... $A$

The output sinusoidal current versus time curve of a rectifier is shown in the figure. The average value of output current in this case is

A $110 \,V$ $d.c$. heater is used on an $a.c.$ source, such that the heat produced is same as it produces when connected to $110 \,V$ $dc$ in same time-intervals. What would be the $r.m.s.$ value of the alternating voltage is .......... $V$

$(a)$ The peak voltage of an $ac$ supply is $300\; V$. What is the $rms$ voltage?

$(b)$ The $rms$ value of current in an ac circuit is $10\; A$. What is the peak current?

An alternating voltage $v\left( t \right) = 220\,\sin \,100\pi l\,volt$ is applied to a purely resistive load of $50\,\Omega $ . The time taken for the current to rise from half of the peak value of the peak value is.....$ms$

An $ac$ source is rated at $220V, 50 Hz.$ The time taken for voltage to change from its peak value to zero is.....$sec$