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Laboratory Procedures
DeVry University
College of Engineering and Information Sciences
I.OBJECTIVES
 To analyze a series AC circuit containing a capacitor (C) and a resistor (R) using Ohm’s Law and Kirchhoff’s Voltage Law.
 To simulate the RC circuit and observe the voltage drops and current at different frequencies.
 To build an RC circuit and measure voltage drops and current at different frequencies.
 To prove that the power delivered by the source is equal to the sum total of power dissipated by all the resistors in the circuit.
II. PARTS LIST
Equipment:
Function generator
DMM (digital multimeter)
Parts:
1  1 K Ω Resistor 1  100 nF Capacitor
Software:
MultiSim 11
III. PROCEDURE
A. Theoretical Analysis
 Given the R & L series circuit in Figure 1, calculate the total equivalent impedance, ZT , of the circuit at frequencies, f = 1 kHz, 2kHz and 3 kHz and list the numbers obtained in Table 1.
Figure 1 – Series RC Circuit
Frequency (kHz) 
Reactance XC (Ω) 
Total Circuit Impedance ZT 

Rectangular Form R + j XC 
Magnitude 
Angle 

1 




2 




3 




Table 1 – RC Circuit Calculated Impedance Values
 Calculate and record the following quantities:
Frequency (kHz) 
IS (RMS)  (A) 
Power Factor 

Rectangular Form 
Magnitude 
Angle 


1 




2 




3 




Table 2 – RC Circuit Calculated Current Values
Frequency (kHz)

VC (RMS) – (Volts) 

Rectangular Form 
Magnitude 
Angle 

1 



2 



3 



Table 3 – RC Circuit Calculated Capacitor Voltage Values
Frequency (kHz)

VR (RMS) – (Volts) 
{VC + VR}(RMS) (Volts) 

Rectangular Form 
Magnitude 
Angle 

1 




2 




3 




Table 4 – RL Circuit Calculated Voltage Values
 Does the sum of the two voltage drops in Table 4 above equal 1 VRMS ?
(YES or NO)
Explain your answer.
 Calculate the power dissipated in the series resistor of this circuit and also the power supplied by the source:
Frequency (kHz) 
PR (W) 
PS (W) 
1 


2 


3 


Table 5  Source Power and Power Dissipation
B. MultiSim Simulation and Circuit Calculations
 Launch MultiSim; build the circuit schematic shown in Figure 2. Include the AC power source and the DMMs.
Figure 2 – MultiSim RC Circuit with Instrumentation
Note# 1: The Multisim AC Power Source has the facility to choose RMS value (2.5 V) for the voltage in addition to the frequency and the phase of your choice.
Note# 2: You could choose any one frequency (1kHz, 2 kHz or 3 kHz) for the source from section A. The figure below shows source frequency as 1 kHz, for example.
 Set the RMS value to 2.5 V and select one of the frequencies (1 kHz, 2 kHz, or 3 kHz) used in Section A.
 Activate the simulation and record the voltage and current reading in Table 5.
Frequency (kHz) 
IS (RMS) 
VC (RMS) 
VR (RMS) (Volts) 




Table 5  MultiSim Simulation Results
 Do the (simulated) voltage and the current values in Table 5 agree with those obtained in Tables, 2, 3 and 4 of Part A? (Circle your answer)
YES NO
 Remove the DMMs from the circuit and attach the wattmeter as shown below:
Figure 3  AC Power Measurement with Wattmeter
 Turn the simulator ON and record the power measurements in Table 6.
Frequency (kHz) 
Source Power, PS (Watts) 
Power Factor 



Table 6  Power Measurement Readings
 Do the numbers in Tables 6 and 2 agree?
If there is any disagreement, investigate the source of error and report your findings below:
C. Construction of a Series R C Circuit on a proto board and Measurement of Circuit Characteristics
 Construct the circuit in Figure 1.
 Set the function generator voltage to 2.5 V RMS. Set the frequency to the same value used in the simulator experiment.
 Set DMM to measure AC current and make the appropriate connections. Switch the function generator power ON.
 Record the current reading.
IS = _____________ (A)
 Is this the same as the simulated value and the calculated value? ________ (YES or NO)
 Switch OFF the AC input power. Remove the DMM and reconfigure it to measure voltages. Reconnect the circuit and apply power. Measure the voltage across C and R one at a time.
 Record these voltages.
VC = ________ (V) VR = ________(V)
Are the voltage readings the same as your calculated and simulated values?
__________ (YES or NO)
 If you answered NO, explain why you think they differ.
IV. TROUBLESHOOTING
Describe any problems encountered and how those problems were solved.
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 Submitted On 19 Feb, 2015 12:33:46
 HomeworkExp
 Rating : 24
 Grade : A+
 Questions : 0
 Solutions :287
 Blog : 1
 Earned : $9754.30