Question

Question 5 (Marks: 2) Q.5.1 (2) Why is the Superposition theorem especially useful with alternating current circuits?

Answer 1

Super position theorem:

It states that in any linear circuit with several sources acting, the current (or voltage) for any element in the circuit is the sum of currents (or voltages) produced by each source acting independently.

Superposition theorem is especially useful with alternating current circuits. Because

1. If an AC circuit has sources operating at different frequencies , superposition theorem can be used to solve the circuit.

Since the impedances depend on frequency, we need have different frequency domain circuit for each frequency.

This possible with superposition theorem .

2. We can use superposition theorem for AC circuit to calculate complex effective or peak value of the contribution of each source apllied individually (one at a time) and then to add the complex values .

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