Thevenin's theorem is a fundamental principle in circuit analysis that states that any linear circuit can be replaced by an equivalent circuit with a single voltage source and a single resistor. This simplifies the analysis of complex circuits and allows for easier calculation of circuit parameters.
To find the Thevenin equivalent at A-B, you need to follow these steps:
1. Remove all the loads (resistors) connected between A-B.
2. Determine the open-circuit voltage between A-B. This is the Thevenin voltage (VTH).
3. Calculate the equivalent resistance (RTH) between A-B by shorting all voltage sources and replacing all current sources with open circuits.
4. The Thevenin equivalent circuit will have a voltage source with magnitude VTH and a resistor with value RTH connected in series.
No, Thevenin's theorem can only be applied to linear circuits. Non-linear circuits do not follow the same rules of superposition and hence cannot be simplified to a single voltage source and resistor.
Thevenin and Norton equivalent circuits are two different methods to simplify a complex circuit. The main difference between them is that Thevenin equivalent uses a voltage source with a series resistor, while Norton equivalent uses a current source with a parallel resistor.
The Thevenin equivalent circuit is an approximation of the original circuit and may not be 100% accurate. However, for most practical purposes, it provides a good estimation of the behavior of the original circuit and is a useful tool for circuit analysis and design.