An incomplete circuit diagram of a bridge rectifier is shown in Fig. 8.1. The variation with time $$\(t\)$$ of the potential difference (p.d.) $$\(V\)$$ across the load resistor is shown in Fig. 8.2. A capacitor is now connected between points C and D of the bridge rectifier. This results in smoothing of the p.d. across the load resistor. The difference between the maximum and minimum values of the smoothed p.d. is $$\(33 \%\)$$ of the peak p.d. $$\(V_{0}\)$$. (i) On Fig. 8.2, draw a line to show the variation of the potential difference $$\(V\)$$ across the load resistor with time $$\(t\)$$. Your line should extend from $$\(t=0.5 T\)$$ to $$\(t=2.0 T\)$$. circuit. unchanged.
Exam No:9702_s25_qp_44 Year:2025 Question No:8(b)
Answer:
Knowledge points:
19.3 Discharging a capacitor
21.2.1 distinguish graphically between half-wave and full-wave rectification
21.2.2 explain the use of a single diode for the half-wave rectification of an alternating current
21.2.3 explain the use of four diodes (bridge rectifier) for the full-wave rectification of an alternating current
21.2.4 analyse the effect of a single capacitor in smoothing, including the effect of the value of capacitance in relation to the load resistance
Solution:
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