Laboratory Procedures 

DeVry University

College of Engineering and Information Sciences

I.                   OBJECTIVES

1.      To analyze a parallel AC circuit containing a resistor (R), an inductor (L), and a capacitor (C). 

2.       To simulate the RLC circuit and observe the circuit responses.

3.      To build the RLC circuit and measure the circuit responses.

II.        PARTS LIST

Equipment:

            IBM PC or Compatible                      

                             Function Generator

DMM (Digital Multimeter)

Parts:

            1 – 470 Ω Resistor                               1 – 1 µF Capacitor

            1 – 47 mH Inductor

Software:  

            MultiSim 11

III.       PROCEDURE

A.        Theoretical Analysis

1.      Given the R, L, & C parallel circuit in Figure 1, calculate the total equivalent admittance, Y_T, and the impedance, Z_T, of the circuit at f = 550 Hz and 1 kHz. List the calculated values in Table 1.

Figure 1: Parallel R, C, L Circuit

Table 1 – Calculated RLC Admittance and Impedance Values

2.      Calculate and record the following quantities:  

Table 2 – Calculated RLC Component Current Values

Does the sum of the magnitudes of the three currents I_R, I_C, and I_L,  in the table above, equal the current, I_S, calculated directly in the last column?

(YES or NO)

Explain why your answer is what it is.

3.      Calculate the power dissipated by the parallel resistor and the power supplied by the source:

Table 3 – Calculated RLC Resistor Power Dissipation

B.        Multisim Simulation and Circuit Calculations

1.    Launch MultiSim and build the circuit schematic shown in Figure 2. Include the AC Power source and the DMMs.

2.      Set both DMMs, XMM1 thru’ XMM4, to read AC measurements and Current, I. See fig. 2 below.

Figure 2: MultiSim RLC Parallel Circuit with Instrumentation

3.      Activate the simulation and record the current readings for both frequencies:

Table 4 – Current Measurements Simulation Results

4.      Do the current values in Table 4 agree with those obtained in Tables, 2, 3, & 4 of Part A? (Circle your answer)   

                                                            YES             NO

5.      Remove the DMMs and attach the wattmeter as shown below:

Figure 3 – AC Power Measurement

6.      Record the measurement from the wattmeter.

Table 5 – Power Measurement Readings

7.      Do values in the Tables 6 and 2 agree?