Discussion
Why can class C reach efficiencies above ninety per cent?
Answer: C
The device conducts only for a brief part of the cycle, near the peak of the voltage waveform where the current and voltage overlap least, so very little energy is dissipated in it. The tank does store energy and reconstruct the sine, but that is what makes the class usable rather than what makes it efficient. It is not a switching class, and its conduction angle is smaller. Reducing the overlap of current and voltage is the general route to efficiency in every class.
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