10 - AC Circuits

# 10 - AC Circuits - Physics 8B 10 AC Circuits rev 4.0 10 AC...

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Physics 8B 10 – AC Circuits rev 4.0 10 – AC Circuits 1. Consider the RC circuit shown, powered by a 398Hz, 12V r.m.s source. a) Q: If graph A below represents the variation with time of current in the 30 resistor, which graph A, B, C or D, BEST represents the variation with time of: i) The potential difference across the 30 resistor? Explain. ii) The current in the 10 µ F capacitor? Explain. iii) The potential difference across the 10 µ F capacitor? Explain. b) P: What is the capacitive reactance of the 10 µ F capacitor? c) P: What is the total impedance of the circuit? d) P: What is the r.m.s current in the circuit? e) P: What is the r.m.s potential difference across: i) The 30 resistor? ii) The 10 µ F capacitor? f) Q: Why do your answers in part e) not add up to the output voltage of the source of 12V? 30 10 μ F 12V, 398Hz A B C D t

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Physics 8B 10 – AC Circuits rev 4.0 2. Consider the RL circuit below. Assume the inductor has a negligible resistance. The circuit is driven by a signal generator with an output of 868Hz, 2.6V r.m.s. a) Q: If graph A below represents the variation with time of current in the 50 resistor, which graph A, B, C or D, BEST represents the variation with time of: i) The potential difference across the 50 resistor? Explain. ii)
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10 - AC Circuits - Physics 8B 10 AC Circuits rev 4.0 10 AC...

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