## Explore the world of electronics | www.daenotes.com

# THEVENIN TREOREM

Thevenin's theorem is a procedure by which we change a complex network in to simple network called thevenin's equivalent circuit.

Thevenin’s equivalent circuit of an open circuit voltage, thevenin voltage, V_{th} and the total resistance from the open terminals side, thevenin's equivalent resistance, R_{th}. Connected both thevenin's quantities in series. In this way we can find the current or voltage of any branch of the circuit.

**STEP#1**

Remove that resistance in which current is wanted

**STEP#2**

Find the open circuit voltage, V_{AB} called thevenin's equivalent voltage, V_{th}.

**STEP#3**

Find the total resistance, from open terminals A and B side is called thevenin's equivalent resistance, Rth removing actual voltage source from the circuit.

**STEP # 4**

Connect V_{th} and Rth in series. This will be the thevenin's equivalent circuit.

**STEP#5**

Reconnect the R_{L} between the open terminals of the thevenin's equivalent circuit.

**STEP#6**

Find the current in R_{L}

As both resistances are connected in series so the in R_{L}. and R_{th} are same.