Name: Class Instructor: TA:
Session:
Voltage Divider Stack and Delta-Wye
Lab 4a
Lab Work Grade
Voltage Divider Stack:
VR1
R1=1kΩ
VR2
R2=2kΩ
VR3
R3=5kΩ
VR4
R4=2kΩ
VR5
R5=1kΩ
Theoretical 0.909 1.82 4.55 1.82 0.909
Measured 0.911 1.82 4.66 1.81 0.903
Delta - Wye Transformation:
1) What is the source current for the circuit shown in slide 6?
Ans: the current is 1.2 mA
2) Solve for R , R , R using ∆↔Y transformation. (Show calculations) Ans:
6 7 8
R6=
RAB∗RAC
RD
=12∗18
36
=6k ohms
R7=
RAB∗RBC
RD
=12∗6
36
=2k ohms
R8=
RAC∗RBC
RD
=18∗6
36
=3k ohms
3) What is the source current for the circuit shown in slide 7?
Ans: the current is 1.2 mA
4) What is the source current for the circuit shown in slide 8?
Ans: the current is 1.22 mA
5) What is the source current for the circuit shown in slide 9?
Ans: the current is 1.209 mA
6) Are both source currents measured for circuits from slides 8 and 9 same? Why?
Ans: they are the same because of the delta- Y transformation. Delta and Y are both
the same and hence why it is equal.
1 Name: Class Instructor: TA:
Session:
Questions:
V1 = 120 V R4 = 10 kΩ
R1 = 6 kΩ R5 = 2.4 kΩ
R2 = 8 kΩ R6 = 5.4 kΩ
R3 = 2 kΩ
1. Build the circuit above on LTspice and simulate it. Show the source current and
calculate the power generated by the source. (20 points)
2. Then apply the Delta-Wye transform on the highlighted portion of the circuit and
draw the new circuit by hand. (Show your calculations) (10 points)
3. Build and simulate the new circuit. Show the source current and calculate the
power generated by the source. (20 points)
NOTE: Your schematic print out MUST show voltages and currents displayed by
LTspice. Show your calculations for Delta to Wye transformation.
Lab Data Sheet:
Attach your hand written Data Sheet with notes taken during the lab. The Data Sheet
must be signed by your lab TA. 2
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