When the needle of an analog ohmmeter indicates infinity, what does this signify about the resistor being measured?

When the needle of an analog ohmmeter indicates infinity, this signifies that there is an open circuit within the resistor being measured. An open circuit means that there is a break in the conductive path, preventing current from flowing through the resistor. As a result, the ohmmeter reads as if the resistance is infinitely high because it cannot establish a continuity of electrical flow.

In the context of a resistor, an open condition typically means that the resistor is no longer performing its function of limiting or controlling electrical current. This reading serves as a diagnostic tool to indicate that the resistor is not operational and requires replacement or further investigation. Understanding this behavior is essential for troubleshooting electrical circuits, where proper resistance values are critical for functionality.