A sinusoidal alternating voltage supply is connected to a bridge rectifier consisting of four ideal diodes. The output of the rectifier is connected to a resistor R and a capacitor C as shown in the figure below.
The function of C is to provide some smoothing to the potential difference across R. The variation with time 
of the potential difference 
across the resistor 
is shown in the graph below.
Use the graph above to determine, for the alternating supply,
the peak voltage,
the root-mean-square (r.m.s.) voltage,
the frequency. Show your working.
The capacitor C has capacitance 
. For a single discharge of the capacitor through the resistor R, use the graph above to
determine the change in potential difference,
determine the change in charge on each plate of the capacitor
show that the average current in the resistor is 
.
Use the graph above and the value of the current given in (b)(iii) to estimate the resistance of resistor R.
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(or 
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