"옴" (pronounced "om") is a unit of electrical resistance in the International System of Units (SI). It is named after the German physicist Georg Simon Ohm, who formulated Ohm's Law, which states that the current through a conductor between two points is directly proportional to the voltage across the two points. One ohm is defined as the resistance that allows one ampere of current to flow when one volt is applied. In practical terms, ohms are used to measure how much a material resists the flow of electric current. Different materials have different resistances, which can affect how electrical circuits function. Understanding ohms is essential for designing and troubleshooting electronic devices and systems.