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Electric Circuits EE 213 Lab Results Exp.3A 1. St.Name:…………………………………… St.NO: ………………………………………. 2.St.Name: …………………………………. St.NO: ……………………………………… 3.St.Name: …………………………………. St.NO: ………………………………………. Sect. No: ……………………………… 1 PART ONE:-Series Circuits Kirchhoff's Voltage Law (KVL) states that the sum of voltages around a closed path is zero. Measure Is………………………………………. Vs/Parameter Name Vab Vbc Vcd Vde Is Vs=15V Vs=27V Compare the sum of these voltages to Vs? Calculate the value of Vab as a percentage of Vs? Vab/Vs=……………………………………… Disconnect the power supply from the circuit, and use DMM2 as an ohmmeter to measure the resistances values; Vs=15 V Resistance name R1 R2 R3 Is Value Use the above values and the measured value of Is to calculate different voltages by Ohm's law, and compare them with the values obtained previously. 2 Voltage name Previous value Calculated values using Ohm's law Vbc Vcd Vde Now, Use voltage division to calculate different voltages, and compare the result with the measured values. Voltage name Vbc Vcd Vde Calculated value Measured value Parallel Circuits: Kirchhoff's Current Law (KCL) states that the sum of all current at any node in a circuit is zero. Is=……………………………………………….. Now place DMM2 in series with R1, R2, and R3 to measure the values of the different currents: Vs/Parameter Name I1 I2 I3 Vs=15V Vs=27V 3 Compare the sum of the above currents with Is? Disconnect the power supply, and use DMM1 as an Ohmmeter to measure the parallel combination of R1, R2, and R3, then measure each resistance separately, and use the measured values of resistance and Vs to calculate the different currents, and compare the results with the measured values of these currents, this is shown in the following table: Current name Calculated value Measured value Is I1 I2 I3 A Consequence of KCL is that the current through one conductance Gk =1/Rk in a parallel circuit can be calculated using the current division Rule , Ik = (Gk /Gt ) It Gt: the sum of all conductances in parallel, including Gk It: the current in to the circuit Calculate I1, I2, and I3 using this rule, and compare the results with the measured values. 4 Series-Parallel Circuits: Voltage Vs V1 V2 V3 V4 V5 V6 Current I1 I2 I3 I4 I5 I6 Resistance name R1 R2 R3 R4 R5 R6 Measured values DMM value Measured value Now, use the measured values of voltages to verify KVL on all closed paths, and use the measured values of currents to verify KCL at all nodes. Finally, use the measured values of resistances with Ohm's law to calculate voltages using measured currents and vice versa, then compare all the measured quantities. 5 Conclusion:- 6