Discussion
What is gate charge a measure of?
Answer: A
Gate charge is the charge a driver must deliver to turn the device on, and it decides the drive current needed at a given switching frequency. It is not leakage, not channel charge, and not depletion charge. A device with no steady gate current still needs substantial pulses of it, which is why gate drivers exist and why switching loss rises with frequency even in a device that draws nothing when static. Framing the question as which quantity the change acts upon makes the answer follow without calculation.
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