A 15 Ω resistor, an inductor with 8 Ω inductive reactance, and a capacitor with 12 Ω capacitive reactance are in parallel across an ac voltage source. The circuit impedance is
A. 12.7 Ω
B. 127 Ω
C. 4,436 Ω
D. 6,174 Ω
Answer: Option A
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A. Increase
B. Remain the same
C. Decrease
D. Be less selective
Z = 1/Y
Y = √ ((1/R)^2 + (1/XL - Xc)^2)
Y = √ ((1/15)^2 + (1/8 - 1/12)^2) = 0.0786
Z = 1/0.0786 = 12.7 ohms