Thevenin and Norton Theorem

Thevenin and Norton Theorem

Thevenin's Theorem

      Thevenin’s theorem for linear electrical networks states that any combination of voltage sources, current sources and resistors with two terminals is electrically equivalent to a single voltage source and a single series resistor.It mean that it is possible to simplify any electrical circuit, no matter how complex it is. For Example:

Method 1

Step 1:  Find the open circuit voltage that will be  which is

Step 2: Take out the voltage source and make a short circuit in source connection

Method 2:  Use source transformation

Voltage source transformation

2 parallel resistances

Current source transformation

2 serial resistances

Norton's Theorem

       Norton’s Theorem states that it is possible to simplify any linear circuit, no matter how complex, to an equivalent circuit with just a single current source and parallel resistance connected to a load. In Norton theorem, we just replace the circuit connected to a particular branch by equivalent current source . In this theorem, the circuit network is reduced into a single constant current source in which, the equivalent internal resistance is connected in parallel with it. Every voltage source can be converted into equivalent current source .It mean that this  theorem is just alternative of Thevenin theorem.