Definition
An electrical component, usually a precision low-resistance resistor, connected in parallel with a circuit or instrument to divert a known portion of the current around it. Shunts are commonly used to extend the range of an ammeter by allowing most of the current to bypass the meter movement, while a small, proportional fraction passes through it for measurement.
Plain English
A small part wired alongside a meter or circuit so that most of the electrical current takes the easier path around it, leaving only a tiny, predictable amount to flow through the meter itself.
Context Anchor
Seen in aircraft electrical-system descriptions, especially around charging systems and current-measuring gauges.
Derivation
From the English verb 'shunt,' meaning to turn aside or move onto a side track — originally used for railway cars switched off the main line. In electrical use, the shunt 'sidetracks' most of the current around the meter.
Why Pilots Care
Enables accurate, continuous monitoring of the aircraft electrical system without risking meter damage or inaccurate readings.
Analogy
A shunt is like a wide side road around a narrow bridge. Most traffic takes the easier side road, while the bridge still lets you tell that traffic is moving through the area.
Intuition Check
Do not read shunt as simply “push aside” or “block.” In electrical use, a shunt is a planned side path that lets current go around another part of the circuit.
Example Sentence 1
The ammeter reads full charging current accurately because a calibrated shunt diverts most of the current around the meter movement.
Example Sentence 2
During the electrical system check, the pilot noted the ammeter reading that depended on the shunt to show battery discharge rate.