An SI unite (symbol Ω, Greek omega) of electrical resistance (the property of a conductor when a potential difference of 1 volt produces a current of 1 ampere and which restricts the flow of electrons through it).

The symbol Ω, the Greek capital letter of omega, unfortunately is not supported by some computer browsers.

A measure of the electrical resistance of a material equal to the resistance of a circuit in which the potential difference of one volt produces a current of one ampere.

A German physicist who studied electricity and discovered the fundamental law that bears his name.

The SI unit of electrical resistance, the ohm, is named for him, and the unit of conductance (the inverse of resistance) was formerly called the mho, which is "ohm" spelled backward.