Red Seal Electrician Practice
AC theoryQuestion 999 of 1506

An ideal parallel L-C circuit is at its resonant frequency. How much current does it draw from the source?

  1. Almost none
  2. The maximum possible
  3. The same as at DC
  4. Twice the inductor current
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Correct answer: Almost none

With infinite impedance, the line current falls to about zero.

Source: Lessons in Electric Circuits II: AC (Kuphaldt), 6.2: Simple Parallel (Tank Circuit) Resonance

Practice ac theory

Questions last reviewed: 18 October 2026