What unit is used to measure electrical resistance?

The unit used to measure electrical resistance is the ohm. Resistance quantifies how much a component opposes the flow of electric current. In electrical circuits, the relationship between voltage, current, and resistance is described by Ohm's Law, which states that the current through a conductor between two points is directly proportional to the voltage across the two points and inversely proportional to the resistance.

Choosing the ohm as the measurement for resistance stems from its defined relationship to voltage and current, where one ohm is the resistance that allows one ampere of current to flow when one volt of electrical potential is applied. Understanding this foundational principle is critical for those working in areas such as cosmetology, where electrical devices may be employed for various beauty treatments, ensuring safety and proper use of equipment.