A 120 Ω resistor is in parallel with a capacitor with a capacitive reactance of 40 Ω. Both components are across a 12 V ac source. What is the magnitude of the total impedance?
A. 37.9 Ω
B. 3.7 Ω
C. 14,400 Ω
D. 4,800 Ω
Answer: Option A
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Related Questions on RC Circuits
When the frequency of the source voltage decreases, the impedance of a parallel RC circuit
A. Increases
B. Decreases
C. Does not change
D. Decreases to zero
For parallel, Admittance (Y) Y=1/Z
Y=(1/R)+(j/Xc)
|Y|= sqrt[(0.00833^2)+(0.025^2)] =0.02634 mho
Z=1/0.02634=37.9 ohms