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Important Ohmmeter Terms to Know

Closed:

In relation to an electrical circuit - meaning that the current can flow or it has continuity.

Continuity:

Means that current can flow. When an ohmmeter is placed across a closed circuit it will read ohms this means that the circuit has continuity.

Infinity ohms:

What an ohmmeter reads when placed on an open circuit. On an analog meter infinity ohms is when the needle doesn’t move at all and on a digital meter infinity ohms is 1.

Ohm:

Defined as the unit of electrical resistance between two points. Named after German physicist Georg Simon Ohm. Symbol: Ω

Ohm’s Law:

States that the current through a conductor between two points is directly proportional to the voltage across the two points:

R= V/I

where I is the current through the conductor in units of amperes, V is the voltage measured across the conductor in units of volts, and R is the resistance of the conductor in units of ohms.

Open:

In relation to an electrical circuit - meaning the current cannot flow or has no continuity.

Resistance:

Is the measure of electrical “friction” as electrons move through a conductor. It is measured in the unit of the “Ohm,” that unit symbolized by the capital Greek letter omega (Ω).

Reading Your Ohmmeter:

Whether you are using an auto ranging meter or a manual adjustment meter for testing, the reading may appear similar to this; (example: .826 k). The “k” symbol stands for 1,000. Using our example provided, the meter is reading 826 ohms of resistance on the circuit.