EECE-2112 Lecture 7: Nodal Analysis
23 Jan 2019
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Identify all nodes and choose one of them to be ground (any node can be ground, but the best choice is the node that has most branches connected to it -> makes the problem simple) Ground has 0v, de ne node voltage variable for other nodes. De ne all unknown branch currents (direction of these currents are arbitrary) (case above i1-i4) Write kcl equations for every node but the ground (ground has dependent equation anyway) Kcl to i t iz writeegs intermsofnodevoltages is12a is it_i4. V 35v us 32su va 26. 25w i in 8. 75a is1. 25a is 325a other. Nodal analysis shortcut #1: combine kcl and ohm"s law to eliminate need for current variables lov. Shorcut #2: for most problems, it is su cient to solve for the essential node voltages. Essential nodes: nodes with three or four branches connected to it. Non-essential nodes: only have two branches connected to it, in order words, elements are in series.
