Definition
An electrical circuit in which two or more components or paths are connected in parallel, so that the total current divides among them and each path carries a share determined by its resistance. The term is also used for a low-resistance path placed alongside a component to divert most of the current around it, commonly used with ammeters to allow them to measure currents larger than their movement could otherwise handle.
Plain English
A side path in a circuit that lets electricity split and flow through more than one route at the same time. It can be used to share current between parts or to send most of the current around a sensitive instrument so it isn't overloaded.
Context Anchor
Seen in aircraft electrical system discussions, especially around ammeters, current sensing, and circuit protection.
Derivation
From the English verb 'shunt,' meaning to turn aside or divert onto a side track (originally from railroad use). In electrical work it kept that meaning: a path that diverts current to the side of the main route.
Why Pilots Care
Accurate ammeter readings depend on an intact shunt; a damaged shunt can give false current indications that hide charging problems or overloads.
Analogy
Think of a side road built beside a busy main road. Some traffic can take the side road, so not all traffic has to pass through the same place.
Intuition Check
A shunt circuit is not automatically a short circuit or a fault. It is often an intentional path used to divert or measure electrical current.
Example Sentence 1
The ammeter uses a shunt circuit so that only a small, measurable portion of the total current passes through the meter itself.
Example Sentence 2
A loose connection at the shunt circuit caused the ammeter to read zero even though the battery was charging normally.