What is Superposition Theorem (Definition)
In an active linear network containing several sources (including dependent sources), the overall response (branch current or voltage) in any branch in the network is equal to the algebraic sum of the responses of individual source considered separately, with all other sources made inoperative, it means replacing them with their internal resistances or impedances.Superposition Theorem (Basics, Applications and Limitations) Video
How to Make a Source (Voltage or Current Source) Inoperative?
To make a source inoperative, it is first short-circuited leaving behind it's internal resistance or impedance, if it is a voltage source.But if it is a current source then it is open circuited leaving behind its internal resistance or impedance.
Applications and Limitations of Superposition Theorem
Applications of Superposition Theorem
1.The superposition theorem is applicable for any linear circuit having time varying or time invariant circuits.2.It is also very useful in the analysis of circuits. The superposition theorem can be very useful when the circuit has large number of sources (current or voltage sources), to find the value of current or voltage in any branch of the circuit.
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Limitations of Superposition Theorem
1.It is not applicable when the circuit contains only dependent sources.2.We cannot apply superposition theorem when a circuit contains nonlinear elements like diodes, transistors etc.
3.As we know that superposition theorem is applicable only for Linear networks, so it cannot be used for power calculations, since the power is proportional to the square (nonlinear) of current or voltage.
4.Superposition theorem is of no use if the circuit contains less than two independent sources.
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