ET304A Electric Circuits Laboratory Lab 1 Kirchhoff's Voltage ..., Summaries of Law

Download ET304A Electric Circuits Laboratory Lab 1 Kirchhoff's Voltage ... and more Summaries Law in PDF only on Docsity! ET304A Electric Circuits Laboratory Lab 1 Kirchhoff's Voltage and Current Laws PURPOSE: This laboratory demonstrates Kirchhoff's Voltage and Current Laws (KVL, KCL). Branch circuit analysis is introduced and used to solve for the theoretical values of voltage and current in simple electrical networks. Measurements from the circuits constructed in the lab are compared to the theoretical values. The sources of error between the theoretical and measured values are examined and computed. PROCEDURE: See attached summary of the circuit analysis method used. This procedure includes a detailed example. STEP 1: Construct the circuit shown in Figure 1. Note the tolerances of the resistors used to construct it for later use and record them in the attached table. All resistor values are given in ohms or kilo-ohms. Measure the voltages across all resistors and record them in the attached table. + V1 12V R1 33k R2 3.9k R3 270 R4 2.7k R5 4.7k R6 3.9k R7 1k R8 1.8k Figure 1. Circuit 1. STEP 2: Compute the theoretical values of the resistor voltages using the technique shown in the attached handout. Record these values for future use in the lab report in the attached table. STEP 3: Calculate the percent error between the voltages calculated and the measured values using the following formula: Fall 2003 exp04a01.doc error%100 V VV ltheoretica ltheoreticameasured =⋅⎥ ⎦ ⎤ ⎢ ⎣ ⎡ − . Where: Vmeasured = the measured value of circuit voltage, Vtheoretical = the calculated value of circuit voltage. Record these values for use in the lab report. STEP 4: Construct the circuit shown in Figure 2. Note the tolerance of the resistors used to construct the circuit and record them in the attached table. Measure all the voltages across the resistors and record them in the table provided. + 10V R7 270 R6 4.7k R5 1k R8 2.7k R4 33k R3 3.9k R2 3.9k R1 1.8k R9 4.7k Figure 2. Circuit 2. STEP 5: Use Ohm's law to calculate the current through each resistor using the measured value of resistor voltage and the measured value of resistance. Enter these currents into the data table provided. STEP 6: Calculate the percentage error for each resistor voltage and record the values in the provided table. What to Include in the Report 1.) The calculations for the voltages in Circuit 1 should be included in an appendix. The calculations should be neat and orderly. These calculations should be done on Engineering paper or typing paper. 2.) The table of data for Circuit 1 should be reproduced in the report and titled. Fall 2003 exp04a01.doc 2