# ECT122 W3 ILab 3

Topics: Resistor, Voltage divider, Cermet Pages: 4 (499 words) Published: January 21, 2015
﻿ECT 122 Week 3 iLab #3 Parts:
DC power supply
Handheld DMM
Wire
1.0kΩ resistor
1.2kΩ resistor
3.3kΩ resistor
10kΩ potentiometer

1. Using the circuit below, calculate the anticipated voltage drops across each resistor and record them below.

Rt = R1 + R2 + R3 = 150Ω + 2.2kΩ + 3.3kΩ = 5650 x 10^3= 5.65kΩ I = V/R = 10V/5.65kΩ = 0.001769 x 10^-3 = 1.77mA

Voltmeter1= 1.77mA x 150Ω = 0.2655 x 10^-3= 265.5mV

Voltmeter2= 1.77mA x 2.2kΩ = 3.89V

Voltmeter3= 1.77mA x 3.3kΩ = 5.84V

2. Download the Multisim file “VD1” from Doc Sharing, Week 3. Run the simulation and record the voltmeter readings.

Voltmeter1= _0.265V_____

Voltmeter2= _3.894V_____

Voltmeter3= _5.841V______

Were the calculated and simulated values the same? (YES/NO) If not, correct the problem and compare the new results. Yes

3. Download the Multisim file “Series3” from Doc Sharing, Week 3. Connect the potentiometer as a variable resistor and set its initial value to 2.2 k. Remember to set the potentiometer before placing it in the circuit. Calculate the total current. Simulate the circuit and record the values below.

This pictures shows the circuit built with the potentiometer. R2 = 2.2 k:
CalculatedSimulated

= _1.298mA_____= ___1.299mA_______
Rt = 1.2kΩ + 2.2kΩ + 3.3kΩ + 1kΩ = 7700 x 10^3 = 7.7kΩ 0.001298 x 10^-3= 1.298mA

How did the simulated values compare to the calculated ones? They matched up correctly.

Change the potentiometer’s value to 4.7 k and recalculate and simulate the circuit. R2 = 4.7 k:
CalculatedSimulated

= __980.39µA_____= _980.392µA______
Rt = 1.2kΩ + 4.7kΩ + 3.3kΩ + 1kΩ = 10,200 x 10^3 = 10.2kΩ 0.00098039 x 10^-6 = 980.39µA

How did the simulated values compare to the calculated ones? They matched up closely.

4. Use the breadboard to construct the circuit above. Verify that the value of each...