Capacitors

Q1: If a current of 40 mA flows through a series circuit consisting of a 0.4 F capacitor and a resistor in series with a 4 kHz, 40 Vac source, what is the total circuit impedance?

A
10 omega.gif

B 100 omega.gif

C 1 k omega.gif

D 1 M omega.gif

ANS:C - 1 k omega.gif

Given: I = 40 m A; C = 0.4μF; f = 4 kHz; V = 40 Vac; ZT =?

Z = Vac /I.
Z = 40 / 40 m A = 1 * 10^3.
Z = 1 k Ω.



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