ECEN 215, Principles of Electrical EngineeringDr. Mina RahimianLecture# 4 Date:9/4/13Ex: 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 SourcesWe can combine parallel connected current sources and series connected voltge sources.Ex. Three light bulbs are connected to a 9v battery. finda) 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.1. Node Voltage Method (Nodal Analysis)Techniques of Circuit AnalysisNodal analysis is a systematic method of circuit analysis. In this method node voltages are takenas 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