What is the unit of electrical resistance known as?

The unit of electrical resistance is known as the ohm. It is a standard unit used in the International System of Units (SI) to quantify how strongly a material opposes the flow of electric current. The concept comes from Ohm's Law, which describes the relationship between voltage (measured in volts), current (measured in amperes), and resistance: V = I × R, where V represents voltage, I represents current, and R represents resistance.

In this context, other options represent different electrical concepts. The volt measures electrical potential or voltage, indicating how much potential energy per unit charge is available to drive electric current through a circuit. The ampere measures the flow of electric current, or how many coulombs of charge flow per second. The watt quantifies electrical power, indicating the rate at which electrical energy is consumed or produced. Understanding these distinctions is essential in grasping overall electrical principles and their applications in esthetics, including devices used for treatments that involve electrical components.