Discussion
Regulating an oscillator's amplitude with a lamp works because its resistance ______ as the amplitude grows.
Answer: D
A filament lamp's resistance rises as it heats, so more amplitude means more negative feedback and the loop gain settles at exactly one without ever clipping. A falling resistance would produce runaway rather than regulation, and a constant one would provide no control at all. A component whose imperfection is precisely the wanted behaviour is a neat inversion, and its thermal inertia is what keeps the control slow enough not to distort the waveform.
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