WAEC Physics 2021 Theory — Question 5
Question 5 of 35 from the West African Examinations Council (WAEC) Physics 2021 Theory paper, with the correct answer and a full explanation.
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4. 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 produced.
Model answer
(a) Part A (the a.c. source/diode arrangement) produces/rectifies the alternating current into a pulsating direct current. Part B (the capacitor) smooths the rectified current into a steadier direct current. (b) The output signal starts as a series of positive humps (full-wave rectified a.c.) which, after smoothing by the capacitor, becomes a nearly steady line with small ripples (smoothed d.c.).
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