The term "ohm" is a unit of measurement used to quantify electrical resistance in a circuit. It is named after the German physicist Georg Simon Ohm, who formulated Ohm's Law, which states that the current flowing through a conductor between two points is directly proportional to the voltage across the two points and inversely proportional to the resistance. In practical terms, one ohm is defined as the resistance that allows one ampere of current to flow when one volt of electrical potential is applied. Understanding ohms is essential for working with electrical systems, as it helps in designing circuits and ensuring they operate safely and efficiently.