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lab2_modified-1 - ECE 53 Fundamentals of Electrical...

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ECE 53: Fundamentals of Electrical Engineering Laboratory Assignment #2: Kirchoff’s Voltage/Current Laws and Thévenin and Norton Equivalent Circuits General Guidelines: - Record data and observations carefully for each lab measurement and experiment. - You must obtain Lab. Assistant’s signature on each page of your lab data before leaving the lab. Signed pages must be included in the report. - Make sure you understand the experiment procedure before executing it. You must obtain enough data to complete the various parts of the procedure. - Request Lab Assistant’s help to verify your circuit before turning on the power supplies and generators. - Please operate the equipment in a reasonable manner. Avoid power supply short circuits. Report failures to the Lab. Assistant. Parts: Equipment: -Resistors as needed Breadboard Digital Multimeter (DMM) Signal Generator Oscilloscope Objective: The objective of this session is to verify the application of Kirchoff’s laws to the bridge circuit and to verify the existence of Thévenin and Norton equivalents for simple circuits through laboratory measurements. Background: Ideal and practical sources Voltage and current sources used in laboratory are not ideal. Ideal voltage sources have zero series resistance and ideal current sources have an infinite parallel input resistance. The absence of any resistors implies that there is no internal power dissipation. In turn when we look at the ideal voltage source (Thevenin circuit without a resistor), we note that if we short circuit the output, the predicted output current is infinitely large, a very non-practical result. In the Norton case (current source without a resistor), the open circuit output voltage will be infinitely large. We then have a circuit that will have a voltage breakdown if we don’t provide a load at the output. Practical sources have some finite resistance associated with them. The function generators in the laboratory have internal resistances of 50 or 600 Ohms, depending on the model. Thevenin and Norton theorems allow us to model the function generator used in lab as follows:
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For both circuits we have added loads that draw the same load current, IL, but the loads need not be otherwise specified at this time. For many applications these circuits can represent complicated circuits that are effectively in a black box that we cannot open and investigate. In this case we cannot distinguish
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