Thevenin circuit, voltage problem

Click For Summary
SUMMARY

The discussion focuses on calculating the voltage Vx in a Thevenin circuit involving a 12A current flowing through a 4-ohm resistor and a 12V voltage source. The voltage Vx is determined by applying Kirchhoff's Voltage Law (KVL), where the voltages Va and Vy are added algebraically. The Thevenin equivalent voltage (Vth) is found by adding the calculated Vx to the 12V voltage source. Additionally, the Thevenin equivalent resistance (Rth) is obtained by shorting the voltage source and opening the current sources.

PREREQUISITES
  • Thevenin's Theorem
  • Kirchhoff's Voltage Law (KVL)
  • Basic circuit analysis techniques
  • Understanding of resistors and current sources
NEXT STEPS
  • Study Thevenin's Theorem applications in circuit analysis
  • Learn advanced techniques for solving circuits with multiple sources
  • Explore Kirchhoff's Laws in more complex circuit scenarios
  • Practice problems involving voltage and current calculations in resistive circuits
USEFUL FOR

Electrical engineering students, circuit designers, and anyone seeking to enhance their understanding of Thevenin circuits and voltage calculations.

th3plan
Messages
93
Reaction score
0

Homework Statement



Ok, i don't understand how they calculate the voltage. how are they getting the Vx? How do i read the circuit to know when to subtract, and add voltages? Also for Voc why do they add them together ?



\
 

Attachments

  • circuit.JPG
    circuit.JPG
    24.4 KB · Views: 430
Physics news on Phys.org
Hi,
12A current can flow only into the 4ohm resistor (12V voltage source branch is "open") --> you find Vy.
The same current can't flow into the 9A current generator, so can only flow into the 12ohm resistor -->you find I1 and Va.
By adding (algebraic) Va and Vy you find Vx (KVL) and by adding with 12V voltage source you find Vth.

You'll find Rth shorting voltage source and opening current sources.
 

Similar threads

Engineering How do I find Vth with the node voltage method?
  • · Replies 10 ·
Replies
10
Views
4K
Engineering Find the Thevenin equivalent circuit
  • · Replies 42 ·
2
Replies
42
Views
7K
Engineering Why are the voltages calculated in this way? (CE BJT Amp circuit)
  • · Replies 8 ·
Replies
8
Views
2K
Why is the Thevenin resistance in this problem 3.2 kΩ?
  • · Replies 17 ·
Replies
17
Views
3K
Engineering How to Calculate Thevenin Equivalent Circuit
  • · Replies 5 ·
Replies
5
Views
3K
Are Overly Complicated Homework Problems Beneficial for Student Learning?
  • · Replies 2 ·
Replies
2
Views
2K
Engineering Attempt at Thevenin Equivalent Circuit
  • · Replies 8 ·
Replies
8
Views
3K
Engineering Finding Current in a Thevenin Circuit
  • · Replies 5 ·
Replies
5
Views
2K
Engineering Finding the Thevenin Equivalent Circuit for a Network with a Load Resistor
  • · Replies 1 ·
Replies
1
Views
2K
Engineering Analyzing the inductor current in the circuit
  • · Replies 1 ·
Replies
1
Views
2K