A 47 Ω resistor is in series with an inductive reactance of 120 Ω across an ac source. The impedance, expressed in polar form, is
A. 47 ∠68.6° Ω
B. 120 ∠68.6° Ω
C. 129 ∠31.4° Ω
D. 129 ∠68.6° Ω
Answer: Option D
This Question Belongs to Electrical Engineering >> RL Circuits
Related Questions on RL Circuits
If the frequency is halved and the resistance is doubled, the impedance of a series RL circuit
A. Doubles
B. Halves
C. Remains constant
D. Cannot be determined without values
When the frequency is decreased, the impedance of a parallel RL circuit
A. Increases
B. Decreases
C. Remains constant
D. Is not a factor
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