# TAMU ECEN 215 - Lec4 (7 pages)

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# Lec4

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## Lec4

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ECEN Class notes

Pages:
7
School:
Texas A&M University
Course:
Ecen 215 - Prin Of Electrical Engr

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ECEN 215 Principles of Electrical Engineering Dr Mina Rahimian Lecture 4 Date 9 4 13 Ex Find the Power dissipated in the 6 ohm resistor The equivalent circuit of a network is different at different terminals Ex Find The equivalent resistance looking into terminals AB AC BC and BD A resistor in parallel with a short ckt can be removed Combining Sources We can combine parallel connected current sources and series connected voltge sources Ex Three light bulbs are connected to a 9v battery find a total current supplied by the battery b the current in each Light bulb c the resistance of each bulb Ex In this circuit is the cable good enough to power the lamps Therefore we need to use a different cable with lower resistance Techniques of Circuit Analysis 1 Node Voltage Method Nodal Analysis Nodal analysis is a systematic method of circuit analysis In this method node voltages are taken as the circuit variables A For a circuit with n nodes and without any voltage sources take these steps 1 Select one node as the reference point assign node voltages for the remaining nodes These are the voltages of the nodes with respect to the reference node 2 Apply KCL at each node Use Ohm s law to express all currents in terms of the node voltages 3 Solve the KCL equations to find the node voltages of unknowns n 1 Ex Find the node voltages Ex Find the node voltages

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