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What is an Ohm?

Updated 10 months ago
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Ohm (ฮฉ) 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
ยตฮฉMicroohmOne microohm is equal to 1/1,000,000 (10-6) of an ohm
mฮฉMilliohmOne milliohm is equal to 1/1,000 (10-3) of an ohm
ฮฉOhmOne ohm is the baseline for all other SI unit conversions
kฮฉKiloohmOne kiloohm is equal to 1,000 (103) ohms
MฮฉMegaohmOne megaohm is equal to 1,000,000 (106) ohms
GฮฉGigaohmOne gigaohm is equal to 1,000,000,000 (109) ohms
TฮฉTeraohmOne Teraohm is equal to 1,000,000,000,000 (1012) ohms

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