Empire Beauty Schools Skin Care Practice Test

The unit used to measure the resistance of an electric current is the Ohm. It is defined as the amount of resistance that allows one ampere of current to flow when one volt of electrical potential is applied. This relationship is described by Ohm's Law, which states that voltage equals current times resistance (V = IR). Understanding resistance is crucial in skin care practices, especially when working with electrical devices like facial machines or lasers. Resistance affects how much current will flow through a circuit, which can impact the effectiveness and safety of such equipment.