Ohm (Ω)

Ohm is the measuring unit of resistance (R) derived from Ohm's law. It is the ratio of b/w unit of voltage (volt) and unit of current (amp). it is an SI unit of resistance and can be defined as the amount of resistance faced by a 1 amp current in a conductor when 1V voltage is applied to it. 

Ohm (symbol Ω) is the electrical unit of resistance.

The Ohm unit was named after George Simon Ohm.

1Ω = 1V / 1A = 1J ⋅ 1s / 1C2

Table of resistance values of Ohm

name symbol conversion example
milli-ohm 1mΩ = 10-3Ω R0 = 10mΩ
ohm Ω


R1 = 10Ω
kilo-ohm 1kΩ = 103Ω R2 = 2kΩ
mega-ohm 1MΩ = 106Ω R3 = 5MΩ


The ohmmeter is a measurement device that measures resistance.

Working Mechanism of Ohmmeter

The working principle of the Ohm meter follows Ohm's law. This meter is usually comprised of two needles. The points between which you wanna calculate the resistance are shorted with respective needles of Ohmmeter. Ohm meter used these days is the combo of a volt meter and an ampere meter. This Ohm meter calculates the amount of voltage provided and the amount of current passing through the conductor and takes the ratio of voltage and current to give the answer of resistance in Ohms on the digital screen. 

What is ohm in simple words?

Ohm's Law can be expressed mathematically as V/I =. This means that the resistance or ratio of current to voltage in all or a portion in an electrical circuit operating at a constant temperature was established in 1827, as a result of the research of German scientist Georg Simon Ohm.

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