Definition
An electronic circuit in which the conductive pathways between components are formed by thin strips of copper bonded to a flat insulating board, rather than by individual wires. Components are mounted on the board and soldered to the copper traces, which carry current between them.
Plain English
A flat board with copper lines printed onto it that act as the wires connecting electronic parts. Instead of running loose wires between components, the connections are built right into the board.
Context Anchor
Seen in aircraft radios, transponders, displays, control units, and other avionics or electrical equipment.
Derivation
Called 'printed' because the copper conductor pattern is laid down on the insulating board using a process similar to printing — the unwanted copper is etched away, leaving the desired circuit pattern behind.
Why Pilots Care
Printed circuits deliver compact, reliable connections that resist vibration and support the consistent performance of aircraft radios and instruments.
Analogy
A printed circuit is like roads built into a small board: electricity follows the metal roads to reach the parts that need it.
Intuition Check
Printed does not mean ink on paper here. It means the electrical paths are permanently formed on a board in a planned pattern.
Example Sentence 1
The shop replaced the printed circuit board in the transponder rather than attempting to repair the damaged traces.
Example Sentence 2
Vibration checks are performed to ensure no cracks develop on the printed circuit traces.