What is the term used for the measurement of the rate at which current is delivered in a circuit?

The measurement of the rate at which current is delivered in a circuit is referred to as an ampere, commonly shortened to "amp." The ampere quantifies the flow of electric charge, specifically how many coulombs of charge pass a certain point in a circuit per second.

Understanding this concept is essential for anyone in the esthetics field, especially when using equipment that relies on electrical power. Each of the other choices corresponds to different electrical measurements: volts measure the electrical potential difference, watts measure the power (which is the rate of energy transfer), and hertz measure the frequency of alternating current (the number of cycles per second).

Thus, recognizing that ampere is the unit that directly relates to the flow or rate of current in a circuit makes it clear that the correct term to use in this context is "amp."