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What is an Ohm?

Updated 6 months ago
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Ohm (Ω) is the SI unit of electrical resistance, named after Georg Ohm, a German physicist. An ohm is defined as the resistance between two points of a conductive medium when 1V (Volt), applied to these points, produces a current of 1A (Ampere). Electrical resistance is measured in SI units and can range from microohm to teraohm, being able to calculate these values in terms of Ohms is key to any electrical equation including resistance calculations.

These values are displayed as:

PrefixNameMeaning
µΩMicroohmOne microohm is equal to 1/1,000,000 (10-6) of an ohm
mΩMilliohmOne milliohm is equal to 1/1,000 (10-3) of an ohm
ΩOhmOne ohm is the baseline for all other SI unit conversions
kΩKiloohmOne kiloohm is equal to 1,000 (103) ohms
MΩMegaohmOne megaohm is equal to 1,000,000 (106) ohms
GΩGigaohmOne gigaohm is equal to 1,000,000,000 (109) ohms
TΩTeraohmOne Teraohm is equal to 1,000,000,000,000 (1012) ohms

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