ECE 282L Circuits I Lab
Exercise #2
Date: 9/15/2023 Name: Ethan Brooks myWSU ID: f835k746
Objective: By the end of this laboratory students should have a good understanding of breadboard connections,
simple circuit building and application of Kirchhoff’s voltage and current laws to analyze simple circuits.
Pre Lab
NONE
Lab experiment: Part 1 - Simulation
a) Simulate the circuit in Figure 1 using Multisim and find the voltage drop across each resistor and current
flowing through each resistor.
Figure-1: Resistors are in series
ECE 282L Circuits I Lab
Exercise #3
b) By applying KCL & Current division in the given circuit in Figure-2 find the currents flowing in each
resistor and voltage drop across each resistor.
Figure-2: Resistors are in parallel
c)
For the post-lab report record the solutions from a & b obtained from Multisim simulation. You can use the
snipping tool to capture the Multisim screen and add it to the post-lab report.
Lab experiment: Part 2 – Circuit building
ECE 282L Circuits I Lab
Exercise #3
Procedure
a) Equipment needed,
i.
DC Power supply
ii.
Multimeter
iii.
Three resistors
iv.
Bread board and connecting wires
b) Use the external digital multimeter to measure and record the values of the three resistors.
(All three resistors should be of different values.)
R1: .986kΩ
R2: 1.967kΩ
R3: 4.99kΩ
c) Using the bread board make the circuit shown in figure 3. Use variable power supply “supply +” from DC
Power supply unit, and “ground” or “GND” can be used from the power supply unit. Use small wires (24
AWG) to make connections. To measure the voltages, use the digital multimeter.
Figure-3 Series connection
i.
ii.
iii.
iv.
Using the digital multimeter measure and record the supply voltage and current.
Measure and record the voltage across each resistor
Measure and record the current through each resistor
Turn off the power supply and multimeter
Element
Voltage
Current
Source
12V
1.512mA
R1
R2
1.49V
2.972V
1.512mA
1.512mA
Table-1 Data table for series circuit
R3
7.538V
1.512mA
d) Repeat part c for the circuit given in figure 4. In figure 4, the current through resistor 𝑅1 is being measured,
similarly current through other resistors and the total current from the source needs to be measured. You may
refer to the simulation of circuit in figure 2 for measurement connections.
Figure-4 Parallel connection
ECE 282L Circuits I Lab
Exercise #3
Element
Voltage
Current
e)
Source
R1
R2
12V
12V
12V
20.673mA
12.17mA
6.1mA
Table-2 Data table for series circuit
R3
12V
2.045mA
Repeat part c for the circuit given in figure 5. In figure 5, the current through resistor 𝑅1 is being measured,
similarly current through other resistors needs to be measured.
Figure-5 Series and parallel combination circuit
Element
Voltage
Current
Source
R1
R2
R3
12V
4.937V
7.063V
7.063V
5.006mA
5.006mA
3.591mA
1.416mA
Table-3 Data table for series and parallel combined circuit
Post Lab:
1.
By applying KVL & Voltage division for the circuit in Figure 3 find the voltage drop across each resistor
and current flowing through each resistor.
For the circuit in Figure 3, V1=1.489V, V2=2.97V, and V3=7.53V. Math for each is shown on the
calculations page. The current flowing through each resistor is the same since they are all in series, by
calculations that current is 1.51mA.
2.
By applying KCL & Current division in the given circuit in Figure 4 find the currents flowing in each resistor
and voltage drop across each resistor.
For the circuit in Figure 4, IR1=12mA, IR2=6.1mA, and IR3=2.4mA. Math for each is shown on the
calculations page. The voltage drop across each resistor is the same since they are all parallel, that voltage
is given as 12V.
3.
Using DC circuit analysis (simple series parallel equivalents for circuit in figure 5) validate that the voltage
and currents you measured in part e meet the voltage and current laws.
Using DC circuit analysis, it was found that IR1=5mA, VR1=4.93V, IR2=3.586mA, VR2=7.05V,
IR3=1.41mA, and VR3=7.05V (All calculations on calculations page). These are all reasonably close to the
measured values we obtained for each of the resistors in this circuit.