Ohmmeters

Definition

An ohmmeter is an instrument used to measure electrical resistance, typically in units of ohms. It is essential for ensuring the proper functioning of circuits.

5 Must Know Facts For Your Next Test

1. Ohmmeters can be either analog or digital, with digital ones providing more precise readings.
2. They must be connected in parallel with the component whose resistance is being measured.
3. To avoid damage, power should be off when using an ohmmeter in a circuit.
4. Ohmmeters use a small internal battery to produce a current through the component under test.
5. The accuracy of an ohmmeter can be affected by factors such as temperature and lead resistance.

Review Questions

Related terms

Voltmeter:

A device used to measure electric potential difference between two points in a circuit.

Ammeter:

An instrument for measuring electric current in amperes.

Multimeter: A versatile tool that combines functions of an ammeter, voltmeter, and ohmmeter into one unit.