AC current, or alternating current, is an electric current that reverses direction periodically. It is commonly used in power supply systems due to its efficient transmission over long distances.
Frequency: The number of cycles per second in an alternating current, measured in Hertz (Hz).
Transformer: A device that changes the voltage level of an alternating current using electromagnetic induction.
Impedance: The total opposition a circuit presents to alternating current, combining resistance, inductive reactance, and capacitive reactance.