An ohm is a unit of electrical resistance in the International System of Units (SI) . It is named after German physicist Georg Simon Ohm, who defined it as the electrical resistance between two points of a conductor when a constant potential difference of one volt (V) applied to these points produces in the conductor a current of one ampere (A), the conductor not being the seat of any electromotive force. In simpler terms, its the equivalent of one volt per one ampere (V/A) . Ohms Law is a formula used to calculate the relationship between voltage, current, and resistance in an electrical circuit. The formula is V = IR, where V is voltage in volts, I is current in amps, and R is resistance in ohms. Ohms Law is especially useful when resistance needs to be calculated, as resistance cannot be measured in an operating circuit.
In addition to its use in electrical circuits, ohms are also used when measuring resistance in speakers. The ohm rating of a speaker refers to its resistance to an amplifiers power, also known as impedance, which affects a speakers sound quality. When purchasing a speaker, the ohm rating is a crucial factor for consideration.
