Engineering Board Exam Reviewer · Circuit Theorems in AC Analysis · hard
Superposition is applied to an ac circuit that has two sources of different frequencies. The correct procedure is to
- add the two phasor responses directly
- analyze the circuit separately at each frequency and add the resulting time-domain responses
- average the two source frequencies
- use only the source with the higher frequency
Answer
B. analyze the circuit separately at each frequency and add the resulting time-domain responses
Solution
Phasors (and impedances) are defined for one frequency only, so each source is analyzed at its own frequency. The results are converted to time functions and then added; adding phasors of different frequencies has no meaning.
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