Find the Thevenin resistance seen at terminals a-b. 20 Ω V Σ10Ω 3 Α 0.5 V

Introductory Circuit Analysis (13th Edition)
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ISBN:9780133923605
Author:Robert L. Boylestad
Publisher:Robert L. Boylestad
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### Finding the Thevenin Resistance

#### Problem Statement
**Objective:** Find the Thevenin resistance seen at terminals \( a-b \).

#### Circuit Description:
The circuit consists of:
1. A 20 Ω resistor connected in series.
2. Parallel elements include:
   - A 10 Ω resistor
   - A 3 A current source
   - A dependent current source labeled \( 0.5 V_o \)

Here is the circuit diagram for clarity:

```
  +---- 20 Ω ----+
  |              |
 V_o            (a)
  |              |     
  10 Ω          (b)
  |              |
  3 A            |
  |              |
  dependent      |
 current source  |
 (0.5 V_o)       |
  |              |
  +--------------+
```

To find the Thevenin resistance \( R_{th} \), follow these steps:

1. **Turn off all independent sources:**
   - Replace the 3 A current source with an open circuit.
   
2. **Analyze the remaining elements:**
   - The 20 Ω resistor and 10 Ω resistor are now in series.
   - The dependent current source \( 0.5 V_o \) is also considered.

3. **Combine series resistances:**
   - The combination of 20 Ω and 10 Ω resistors gives the equivalent resistance.

#### Additional Notes:
- Remember that while independent sources are turned off (current sources open, voltage sources shorted), dependent sources remain in the analysis.
- Use Ohm's law and Kirchhoff's laws as necessary for detailed calculations.

By following these steps, you can determine the Thevenin equivalent resistance at terminals \( a-b \).
Transcribed Image Text:### Finding the Thevenin Resistance #### Problem Statement **Objective:** Find the Thevenin resistance seen at terminals \( a-b \). #### Circuit Description: The circuit consists of: 1. A 20 Ω resistor connected in series. 2. Parallel elements include: - A 10 Ω resistor - A 3 A current source - A dependent current source labeled \( 0.5 V_o \) Here is the circuit diagram for clarity: ``` +---- 20 Ω ----+ | | V_o (a) | | 10 Ω (b) | | 3 A | | | dependent | current source | (0.5 V_o) | | | +--------------+ ``` To find the Thevenin resistance \( R_{th} \), follow these steps: 1. **Turn off all independent sources:** - Replace the 3 A current source with an open circuit. 2. **Analyze the remaining elements:** - The 20 Ω resistor and 10 Ω resistor are now in series. - The dependent current source \( 0.5 V_o \) is also considered. 3. **Combine series resistances:** - The combination of 20 Ω and 10 Ω resistors gives the equivalent resistance. #### Additional Notes: - Remember that while independent sources are turned off (current sources open, voltage sources shorted), dependent sources remain in the analysis. - Use Ohm's law and Kirchhoff's laws as necessary for detailed calculations. By following these steps, you can determine the Thevenin equivalent resistance at terminals \( a-b \).
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