Superposition Theorem for AC Circuits

Consider encountering a circuit in a steady state where all its inputs are sinusoidal, yet they do not all possess the same frequency. Such a circuit is not classified as an alternating current (AC) circuit, and consequently, its currents and voltages will not exhibit sinusoidal behavior. However, this circuit can be analyzed using the principle...

The superposition principle finds application in the analysis of AC linear circuits with multiple independent sources.

Consider a circuit consisting of two resistors, an inductor, and two independent sinusoidal sources with different frequencies. The superposition theorem can be used to determine the voltage drop across the resistor.