Definition
An electrical circuit that contains resistance (R), inductance (L), and capacitance (C) connected together, either in series or in parallel. The combined behavior of these three elements determines how the circuit responds to alternating current at different frequencies, including its resonant frequency, impedance, and how it stores and releases energy.
Plain English
A circuit built from three basic electrical parts working together: one that resists current, one that reacts to changes in current, and one that stores an electrical charge. The way these three interact decides how the circuit behaves with AC power.
Context Anchor
Seen in aircraft electrical, radio, and avionics discussions, especially when describing circuits that tune, filter, or smooth electrical signals.
Derivation
The name is simply the three component symbols used in electrical engineering: R for resistance, L for inductance (the letter L was chosen long ago to honor physicist Heinrich Lenz), and C for capacitance. Knowing what each letter stands for makes the circuit's makeup obvious from the name.
Why Pilots Care
RLC circuits are the building blocks of radio tuners, navigation receivers, and filter circuits in aircraft avionics. When a pilot tunes a VOR or COM radio to a specific frequency, an RLC circuit inside the radio is what selects that frequency and rejects others.
Analogy
An RLC circuit is a little like a water system with a narrow pipe, a springy section, and a small storage tank. Each part affects the flow in a different way, and together they control how the flow changes.
Intuition Check
RLC is not a single special part. It describes a circuit that combines three electrical behaviors: limiting current, resisting quick current change, and storing charge.
Example Sentence 1
The avionics technician explained that the radio's tuning stage uses an RLC circuit to select the desired frequency.
Example Sentence 2
An RLC circuit in the navigation receiver helps reject unwanted signals from nearby transmitters.