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## Main Question or Discussion Point

I am studying the analogy between mechanical oscillations and AC circuits.

For a mass on a spring, resonance occurs when there is a phase difference of 90 degrees. It seems like for a series RLC circuit, resonance must occur at a phase different of 0 degrees between the voltage from the source and the current (because inductive and capacitive reactances cancel).

Why does the analogy break down there?

For a mass on a spring, resonance occurs when there is a phase difference of 90 degrees. It seems like for a series RLC circuit, resonance must occur at a phase different of 0 degrees between the voltage from the source and the current (because inductive and capacitive reactances cancel).

Why does the analogy break down there?