Extra exam question E7B08

WhySwitching amplifiers are more efficient than linear amplifiers because the switching device is at saturation or cutoff most of the time. Switching amplifiers are more efficient than linear amplifiers because their active devices spend almost all their time either fully saturated (fully on, minimal voltage drop) or fully cut off (fully off, no current flow), both conditions where very little power is wasted as heat in the device itself, answer B. It isn't about operating at higher voltages, isn't really about linear amplifiers having more harmonic content from high gain, and using push-pull circuits isn't what specifically makes switching amplifiers efficient.