Nodal Analysis with Voltage Sources

Monday, 20 August 2018

12:26 PM

Voltage sources generate or dissipate power at a specified voltage with whatever current is required. (Voltage known, current is not known) (Remember that Ohm's Law cannot be used here)

 

Case 1: Voltage source is between a reference and non-reference node
Set the voltage at the non-reference node to the voltage of the source

 

Case 2: Voltage source is between two non-reference nodes
Two nodes form a supernode

Voltage across the voltage source can be expressed in terms of node voltages (KVL)

 

A supernode is formed by enclosing a voltage source connected between two non-reference nodes and any element connected in parallel with it

 

1. The voltage source inside the supernode provides a constraint equation needed to solve node voltages
2. A supernode has no voltage of its own
3. A supernode requires the application of both KCL and KVL