The circuit diagram below is a simple current rectifier circuit. Use it to answer the questions that follow: (a) State the function of each of the parts lab...
Question 1 Report
The circuit diagram below is a simple current rectifier circuit. Use it to answer the questions that follow:
(a) State the function of each of the parts labelled A and B.
b) Sketch the output signal produces.
Answer Details
A is the a.c. supply (source). It produces an alternating potential difference, so its polarity reverses continuously.
B is the smoothing capacitor. It charges when the rectified voltage rises and discharges through the load when the rectified voltage falls. This reduces the variation in the output, producing a smoother d.c. voltage with a small ripple.
The output is therefore direct current with ripple: it stays positive and does not reverse direction, but is not perfectly constant.
Examination point: do not draw negative half-cycles after the rectifier. The capacitor makes the positive output flatter, but some ripple remains because it discharges between voltage peaks.
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