The SI unit of resistance is the ohm, symbolized as Ω. One ohm is defined as the resistance of a conductor through which a current of one ampere flows when a voltage of one volt is applied across it. This means:
1 Ω=1 volt1 ampere1,\Omega =\frac{1,\text{volt}}{1,\text{ampere}}1Ω=1ampere1volt
The unit is named after the German physicist Georg Simon Ohm, known for Ohm's law which relates voltage, current, and resistance.
