10 - AC Circuits

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

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Physics 8B 10 – AC Circuits rev 4.0 1 10 – AC Circuits 1. Consider the RC circuit shown below, powered by a 398Hz 12V r.m.s source. 30 ! 10μF 12V 398Hz a) If the variation of current with time in the 30 ! resistor is represented by graph A below, which of the graphs, A, B, C or D, best represents the variation with time of: t i) The potential difference across the 30 ! resistor? Explain. ii) The current in the 10 " F capacitor? Explain. iii) The potential difference across the 10 " F capacitor? Explain. b) What is the capacitive reactance of the 10 " F capacitor? c) What is the total impedance of the circuit? d) What is the r.m.s current in the circuit? e) What is the r.m.s potential difference across: i) The 30 ! resistor? ii) The 10 " F capacitor? f) Why do your answers in part e) not add up to the output voltage of the source of 12V? A B C D Physics 8B 10 – AC Circuits rev 4.0 2 2. Consider the RL circuit shown 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. 22mH 50 ! 2.6V 868Hz a) If graph A below represents the variation with time of current in the 50 ! resistor, which one of the graphs A, B, C or D, best represents the variation with time of: t i) The potential difference across the 50 ! resistor? Explain. ii)

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## This note was uploaded on 09/18/2011 for the course PHYSICS 8B taught by Professor Shapiro during the Fall '07 term at Berkeley.

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

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