Discussion
What does a MOSFET's on-resistance mean for its conduction loss?
Answer: D
A resistance dissipates current squared times resistance, so doubling the current quadruples the loss - unlike a bipolar device's roughly constant saturation voltage, whose loss is proportional to current. That difference decides which device wins at a given current: MOSFETs at moderate currents and low voltages, bipolar or insulated-gate devices where the current is very high. A loss law of a different order changes the answer as the operating point moves.
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