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McMaster University 1EL3
Lab 6
Thevenin’s Theorem Introduction
The purpose in this experiment is to study the Thevenin theorem. The theorem works by making complicated circuits easier to work with. By only leaving one source in the circuit and one resistor. Then calculating Rth and Eth across the load point we need.
McMaster University 1EL3
Results
Part 1: Colours
Expected
Resistance
Measured
Resistance
R1
Brown, Red, Red
1.2 kΩ
1.194 kΩ
R2
Red, Yellow, Red
2.4 kΩ
2.38 kΩ
R3
Brown, Blue, Red
1.6kΩ
1.597 kΩ
R
L
Yellow, Violet,
Brown
0.470 kΩ
0.468k Ω
Step 3, 4, and 5
Calculated
Measured
%Error
McMaster University 1EL3
Thevenin Voltage
6V
6.14 V
2.3%
Thevenin Resistance
2.4 k
Ω
2.38 k
Ω
0.71%
Step 2 & 6
Original
Circuit
Thevenin’s Equivalent
circuit
Measured Load
Voltage
1.006V
1.033V
Measured Load
Current
2.14 mA
2.14 mA
MultiSim Circuit
Calculations -
To calculate Thevenin voltage in step 3-5: replace where the resistor 470 ohms which is the load by an open circuit and measure V. V load = VR2= 6v
-
To calculate Thevenin resistance in step 3-5: replace voltage sources by short circuit and current sources by open circuit. Measure resistance at the load.
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McMaster University 1EL3
(1.6+ ((1/1.2)+(1/2.4))
-1
)) = 2.4
k
Ω
Analysis Questions
1-
Calculate the theoretical load voltage (Vab) and current (IL) of the circuit in Figure 1.1, using series-parallel circuit simplifications. Show your detailed solution.
-
Vab= ((470Ω/(470Ω+1600Ω ) x 9) /2 = 1.022 V
-
IL = 1.022/ 470 = 2.173 mA
Conclusion
This lab gives a better understanding of the Thevenin theorem. By opening or short-circuiting voltage or current sources and leaving only one source and resistance then measuring across the load point we
McMaster University 1EL3
need. Also, by making the circuit simpler and easier to work with. It is very useful for complicated circuits.
Related Questions
Please in typing format please ASAP for the like
Please answer the same to
arrow_forward
*Use 4 decimal places.
**Note D1 is Germanium, D2 is Silicon,
For the circuit below, determine the diode voltages VD1 and VD2, diode currents ID1 and ID2, and voltage across the resistor,
VRLIMIT. Use practical model.
Assume r'a=150. VBIAS = 15V and RLIMIT = 1.5kohms.
VD1 = Blank 1 V; VD2 = Blank 2 V; Ip1 = Blank 3 mA; Ip2 = Blank 4 mA ; VRLIMIT = Blank 5 V
Capture3(1).JPG
+Vo1-
+VRLIMIT
+VD2-
Io2
VBIAS
arrow_forward
AsP plzzzz
arrow_forward
Question 3
(a) Briefly explain what is the per-unit systero.
(b) A resistance of 60n is selected as the base resistance in a circuit
consists of three resistors. If R, =1002, R, =30002 and
%3D
R, = 200 calculate the per-unit vahue of each resistance.
%3D
(c) A power of, P-25KW and a voltage of, E-2400V are selected
as the base power and base voltage of a power system respectively.
Calculate the value of the base impedance, Z, and the base
current, I,.
(d) A resistor bas a per-nnit value of 5.3. Given the base power is
P=250KW, and the base voltage is E,-12470V, calculate the
ohmic value (actual value) of the resistor.
(e) A 4000 resistor caries a cucrent of 60A. Given the base valne of
voltage, E, 4KV, the base value of power, P, 500KTF, the
base value of current, I, =125.4, and the base value of resistor,
2, = 320 calculate the following:
i The per-unit resistance.
ii. The per-unit current.
ii. The per-unit voltage across the resistor.
iv. The per-unit power.
arrow_forward
Electrical engineering
arrow_forward
B..
What is the load current for the circuit shown in the figure?
Please choose one:
a.
6.0 mA
b.
3.0 mA
C.
9.0 mA
D.
7.5 mA
arrow_forward
This question is not graded this is a practice question
arrow_forward
100
150
+ VA-
a
+
-7V,
81.
52
Figure 2 shows a simplified model of a gas-discharge
lamp. One characteristic of these lamps is that they
exhibit negative resistance; in other words, as current
increases the voltage drops further, making such
lamps inherently unstable. As such, a current-limiting
ballast is required. For the connection shown in the
figure:
1. Find the equivalent Thevenin circuit of the lamp.
2. Find the ballast resistance needed to limit the
current drawn from a 24-volt source to 6 amperes.
arrow_forward
Part A shown in image,
part B) for the circuit find the load resistance (RL) that draws the maximum amount of power from the rest of the circuit and calculate the maximum power that can be delivered to RL
c) calculate the range of resistance values for rl that will result in more than 10 watts of power absorbed in rl
arrow_forward
SEE MORE QUESTIONS
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Delmar's Standard Textbook Of Electricity
Electrical Engineering
ISBN:9781337900348
Author:Stephen L. Herman
Publisher:Cengage Learning
Related Questions
- Please in typing format please ASAP for the like Please answer the same toarrow_forward*Use 4 decimal places. **Note D1 is Germanium, D2 is Silicon, For the circuit below, determine the diode voltages VD1 and VD2, diode currents ID1 and ID2, and voltage across the resistor, VRLIMIT. Use practical model. Assume r'a=150. VBIAS = 15V and RLIMIT = 1.5kohms. VD1 = Blank 1 V; VD2 = Blank 2 V; Ip1 = Blank 3 mA; Ip2 = Blank 4 mA ; VRLIMIT = Blank 5 V Capture3(1).JPG +Vo1- +VRLIMIT +VD2- Io2 VBIASarrow_forwardAsP plzzzzarrow_forward
- Question 3 (a) Briefly explain what is the per-unit systero. (b) A resistance of 60n is selected as the base resistance in a circuit consists of three resistors. If R, =1002, R, =30002 and %3D R, = 200 calculate the per-unit vahue of each resistance. %3D (c) A power of, P-25KW and a voltage of, E-2400V are selected as the base power and base voltage of a power system respectively. Calculate the value of the base impedance, Z, and the base current, I,. (d) A resistor bas a per-nnit value of 5.3. Given the base power is P=250KW, and the base voltage is E,-12470V, calculate the ohmic value (actual value) of the resistor. (e) A 4000 resistor caries a cucrent of 60A. Given the base valne of voltage, E, 4KV, the base value of power, P, 500KTF, the base value of current, I, =125.4, and the base value of resistor, 2, = 320 calculate the following: i The per-unit resistance. ii. The per-unit current. ii. The per-unit voltage across the resistor. iv. The per-unit power.arrow_forwardElectrical engineeringarrow_forwardB.. What is the load current for the circuit shown in the figure? Please choose one: a. 6.0 mA b. 3.0 mA C. 9.0 mA D. 7.5 mAarrow_forward
- This question is not graded this is a practice questionarrow_forward100 150 + VA- a + -7V, 81. 52 Figure 2 shows a simplified model of a gas-discharge lamp. One characteristic of these lamps is that they exhibit negative resistance; in other words, as current increases the voltage drops further, making such lamps inherently unstable. As such, a current-limiting ballast is required. For the connection shown in the figure: 1. Find the equivalent Thevenin circuit of the lamp. 2. Find the ballast resistance needed to limit the current drawn from a 24-volt source to 6 amperes.arrow_forwardPart A shown in image, part B) for the circuit find the load resistance (RL) that draws the maximum amount of power from the rest of the circuit and calculate the maximum power that can be delivered to RL c) calculate the range of resistance values for rl that will result in more than 10 watts of power absorbed in rlarrow_forward
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Recommended textbooks for you
- Delmar's Standard Textbook Of ElectricityElectrical EngineeringISBN:9781337900348Author:Stephen L. HermanPublisher:Cengage Learning
Delmar's Standard Textbook Of Electricity
Electrical Engineering
ISBN:9781337900348
Author:Stephen L. Herman
Publisher:Cengage Learning