1a
3 marks
3 marksA sinusoidal alternating potential difference (p.d.) from a supply is rectified using a single diode.
The variation with time t of the rectified potential difference V is shown in Fig. 5.1.
Fig. 5.1
(i)
Determine the root-mean-square (r.m.s.) value of the supply potential difference before rectification.
r.m.s. potential difference = .................................. V [2]
(ii)
State the type of rectification shown in Fig. 5.1.
[1]
1b6 marks
6 marksThe alternating potential difference is rectified and smoothed using the circuit in Fig. 5.2.
Fig. 5.2
The capacitor has capacitance C of 85 μF and the resistor has resistance R.
The effect of the capacitor and the resistor is to produce a smoothed output potential difference VOUT. The difference between maximum and minimum values of VOUT is 2.0 V.
(i)
On Fig. 5.1, draw a line to show VOUT between times t = 1.0 ms and t = 5.0 ms.
[3]
(ii)
Determine the time, in s, for which the capacitor is discharging between times t = 1.0 ms and t = 5.0 ms.
time = .................................... s [1]
(iii)
Use your answers in (b)(i) and (b)(ii) to calculate the resistance R.
R = ........................................ Ω [2]
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