In the half wave rectifier circuit operating from $50\, Hz$ mains frequency,the fundamental frequency in the ripple would be......$ Hz$

Match List $I$ with List $II$.

List $I$	List $II$
$(a)$ Rectifier	$(i)$ Used either for stepping up or stepping down the $a.c.$ voltage
$(b)$ Stabilizer	$(ii)$ Used to convert $a.c.$ voltage into $d.c.$ voltage
$(c)$ Transformer	$(iii)$ Used to remove any ripple in the rectified output voltage
$(d)$ Filter	$(iv)$ Used for constant output voltage even when the input voltage or load current change

Choose the correct answer from the options given below:

In a half-wave rectifier using a $PN$ junction diode,the input voltage has an amplitude of $25 \ V$ and a frequency of $50 \ Hz$. No filter is used,and the load resistance is $1000 \ \Omega$. The forward resistance of the diode is $10 \ \Omega$. Calculate the peak,average,and $rms$ values of the load current,respectively.

In the block diagram of a simple rectifier circuit,from a variable $A.C.$ voltage,constant $D.C.$ voltage is obtained. The correct order of operation is

Draw the output waveform across the resistor for the given circuit and input waveform.

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