What do amps measure in electrical terms?

Amps, or amperes, specifically measure the strength of an electric current flowing through a circuit. This unit quantifies the amount of charge that passes through a conductor in a given amount of time, indicating how much electricity is flowing. Understanding this is crucial for estheticians, especially when using electrical equipment such as facial devices, where the correct current strength is necessary for safe and effective operation.

In contrast to the other options, voltage refers to the electrical potential difference in a circuit, while resistance indicates how much a material opposes the flow of current. Frequency is related to the number of cycles per second of a signal in electrical terms but does not pertain to the direct measurement of electric current's strength. Therefore, recognizing that amps indicate the strength of current is fundamental for properly managing and utilizing electrical devices in skincare treatments.