A resistance reading of 0 Ω across a coil indicates that the coil is what?

A resistance reading of 0 Ω across a coil indicates that the coil is shorted. In electrical terms, a coil with zero resistance has essentially become a low-resistance path, allowing current to flow without restriction. This condition signifies that the wire turns within the coil are directly connected to each other, offering no resistance to the flow of electricity. As a result, this leads to excessive current that can cause overheating and potential damage to the component.

In contrast, coils should typically display a greater resistance due to the wire's material and length. When a coil reads as open, it indicates a broken connection, and when grounded, it suggests an unintended connection to the ground. A functional coil would show a resistance value indicating it is operational, rather than a straight zero resistance, which signifies a short circuit condition.