An amp is a unit of electric ?

• A. Current
• B. Voltage
• C. Power
• D. Strength

Answer: (D)

An ampere measures electric current—the rate at which electric charges pass a point in a circuit. It tells you how much charge moves per second. Voltage, measured in volts, is the electrical pressure that pushes charges through the circuit. Power, measured in watts, is the rate at which electrical energy is used or produced and equals voltage times current. Strength isn’t a standard electrical unit. Because amperes quantify current, they are the unit used to describe the flow of electricity in a circuit. In practical terms for esthetic devices, current indicates how much electricity is flowing, while voltage and resistance determine that flow and power indicates the energy delivered.