Alternating Current: Practice Problem & Solution
28. An series L-C-R circuit is connected to a source of A.C. current. At resonance, the phase difference between the applied voltage and the current in the circuit, is (1994)
Solution Explained:
To solve this problem, we apply the core principles of Alternating Current. Understanding the underlying formula is key to arriving at the correct answer below:
At resonance in a series L-C-R circuit, the inductive and capacitive reactances cancel out ($X_L = X_C$).
The total impedance of the circuit is purely resistive ($Z = R$).
Since the circuit is purely resistive, the current and applied voltage are in phase.
Therefore, the phase difference between the applied voltage and current is zero.
Leave a Reply