When checking an electrical circuit with an ohmmeter, what does a reading of 'OL' or '∞' indicate?

A reading of 'OL' or '∞' on an ohmmeter indicates an open circuit. This means that there is an infinite resistance present in the circuit, implying that there is a break or disconnection somewhere along the pathway that prevents current from flowing.

In practical terms, when the meter displays 'OL' (Over Limit) or '∞' (infinity), it signifies that the resistance is higher than the maximum measurable value of the ohmmeter, indicating that the circuit is not complete. This could be due to a blown fuse, a damaged wire, or a component that has failed, interrupting the continuity of the circuit.

The other options represent different conditions in a circuit. A short circuit would show very low resistance; a closed circuit would show finite resistance; and normal resistance usually reflects a properly functioning circuit that's not open or shorted. Therefore, recognizing an 'OL' or '∞' reading is critical for diagnosing circuit issues effectively.