Discussion
Why does a MOSFET's switching loss rise with frequency?
Answer: B
Each transition moves the gate charge, and that energy is dissipated in the driver and in the device, so the total is proportional to frequency. On-resistance and threshold do not depend on frequency, and the channel current is set by the load. That a static device with no steady input current still costs power to switch is the essential economics of every switching converter and every logic gate. Checking the units of each quantity catches a wrong formula before the arithmetic begins.
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