How does AC electricity work and what are its key principles?

AC electricity, or alternating current electricity, works by constantly changing direction and magnitude of the flow of electrons in a circuit. This change in direction occurs at a specific frequency, typically 50 or 60 hertz. The key principles of AC electricity include voltage, current, frequency, and impedance. Voltage is the force that pushes electrons through a circuit, current is the flow of electrons, frequency is the rate at which the direction of the current changes, and impedance is the opposition to the flow of current in a circuit.