# When does the open resistor read an infinite value in an ohmmeter?

When an ohmmeter reads an infinite value (often displayed as “∞” or “OL” for overload), it indicates that the resistor or component being measured has an open circuit. This means there is no continuous path for current to flow through the resistor, either due to a broken connection, a disconnected component, or an extremely high resistance that the ohmmeter cannot measure within its range. In practical terms, an infinite reading on an ohmmeter signifies that the resistance between the two test points is so high that no measurable current can flow through the circuit.

An ohmmeter reading infinity means that the resistance being measured is beyond the range of the ohmmeter to measure accurately. This typically occurs when the resistance is very high, approaching or exceeding the upper limit of the ohmmeter’s range. The infinity reading indicates that the circuit is effectively open, with negligible or no current flow through the resistor or component under test.

The ohmmeter reading for an open resistor is infinity (∞ Ω). This reading signifies that the resistor is not conducting any current due to an open circuit condition. An open resistor could result from a broken wire or a component failure where the resistor no longer provides a continuous path for current flow. In such cases, the ohmmeter indicates an infinite resistance value because it cannot detect any current passing through the resistor.

When it is said that a resistor is infinite, it means that the resistor has an extremely high resistance value, effectively acting as an open circuit. This condition can occur due to physical damage, such as a broken wire or a disconnected component, or it may indicate a deliberate open condition in a circuit design. An infinite resistor does not allow current to pass through it under normal operating conditions, resulting in very high resistance that an ohmmeter detects as infinity (∞ Ω).

An open switch, a disconnected wire, or a component with a broken connection should measure infinite resistance (∞ Ω) when tested with an ohmmeter. This reading indicates that there is no continuous path for current flow through the circuit, either due to a physical break or an intentional open condition. Testing for infinite resistance is crucial for identifying faults in circuits where continuity is essential, ensuring proper functionality and safety in electrical and electronic systems.