Tag Archives: Turning sources off

Superposition method - Circuit with two sources

Find I_x using superposition rule:
Main cuircuit to be analyzed using superposition method



The superposition theorem states that the response (voltage or current) in any branch of a linear circuit which has more than one independent source equals the algebraic sum of the responses caused by each independent source acting alone, while all other independent sources are turned off (made zero).
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Thévenin's Theorem - Circuit with Two Independent Sources

Use Thévenin's theorem to determine  I_O.

Thevenin's Theorem - Circuit containing two independent sources

Fig. (1-27-1) - Circuit with two independent sources

Lets break the circuit at the  3\Omega load as shown in Fig. (1-27-2).
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Superposition Method - Circuit With Dependent Sources

Determine  I_x ,  I_y and  V_z using the superposition method.

Superposition - Circuit with dependent sources

I. Contribution of the  -2V voltage source:
We need to turn off the current source by replacing it with an open circuit. Recall that we do not turn off dependent sources. The resulting circuit is shown below.
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Superposition Problem with Four Voltage and Current Sources

Determine  V_x and  I_x using the superposition method.
A circuit with four voltage and current sources to be solved by the superposition method
I. Contribution of the  -5V voltage source:

To find the contribution of the  -5V voltage source, other three sources should be turned off. The  3V voltage source should be replaced by short circuit. The current source should be replaced with open circuits, as shown below.
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