Part of an electric circuit is shown in the figure below.
The circuit is used to produce half-wave rectification of an alternating voltage of potential difference (p.d.) 
. The output p.d. across the 
resistor is 
.
A component is missing from the circuit of the figure above. Complete the circuit diagram in the figure by adding the circuit symbol for the missing component, correctly connected.
A capacitor C is shown in the circuit in the figure above. State the effect on of including the capacitor in the circuit.
The graph below shows the variation with time 
of .
The graph below shows the variation with of .
Determine the frequency of .
Show that the time constant 
for the discharge of the capacitor through the resistor is 
.
Calculate the capacitance of 
. Give a unit with your answer.
.
.
