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I am trying to understand how noise affects the potential measured across a certain point of a circuit.

If we have two alternating voltage sources in a circuit, I understand that the "sum" of the potentials provided can affect the potential at the point of interest. However, I am having trouble understanding where this third form of potential comes from and how exactly it can change the resultant voltage waveform at the point of interest!

Let me know if this is unclear and thank you!

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# Effect of noise on a circuit

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