What is Thevenin’s Theorem (Thevenin Equivalent)?Thevenin theorem (also known as the Helmholtz–Thévenin theorem) states that any linear circuit containing only voltage sources, current sources, and resistances can be replaced by an equivalent combination of a voltage source (VTh) in series with a single resistance (RTh) connected across the load. This simplified circuit is known as the Thevenin Equivalent Circuit.Thevenin’s theorem was invented by a French engineer Léon Charles Thévenin (hence t