Ohm

The SI unit of electrical resistance, equal to one volt per ampere. Its symbol is Ω.

Electrical resistance: A measure of how strongly a component opposes electric current. An ohm is the SI unit used to quantify this property.
Ohm's law: The relation V = IR for an ohmic component at fixed physical conditions. It calculates resistance in ohms from voltage and current.
Georg Ohm: A German physicist who formulated the relation between voltage, current, and resistance known as Ohm’s law. The electrical unit was named in his honor.
Electrical resistor color code: A system of colored bands that encodes a resistor’s resistance value and tolerance. The bands commonly encode resistance as a number of ohms.
Electric current: The rate at which electric charge flows through a conductor or circuit. The ampere in the ohm’s definition measures this flow.
Resistor: An electrical component designed to provide a specified resistance in a circuit. Its rated resistance is commonly stated in ohms.
International System of Units: The internationally agreed system of measurement units, abbreviated SI. The ohm is the SI derived unit for electrical resistance.
Multimeter: An instrument that measures electrical quantities such as voltage, current, and resistance. Its resistance mode reports values in ohms.
Electric potential difference: The difference in electric potential energy per unit charge between two points. The volt in the ohm’s definition measures this difference.
Electrical conductance: A measure of how readily a component conducts electric current, measured in siemens. Conductance is the reciprocal of resistance, so its unit is the reciprocal of the ohm.

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