An ideal FET should not have any gate current. A practical one probably has, but way less than that of a transistor. The current used to calculate the power dissipation is the drain/collector current, and NOT the gate current! (Assuming base/gate currents are small compared to drain/collector currents) Normally gate current would be in the order of uA, while base current would be in the range of mA. Power MOSFETs usually dissipate a lot of heat for the simple reason that they usually sustain much higher current loads than power transistors.Kevin Weddle said:There is also a gate current associated with FETs. To say they use less power is something that is debatable. In fact, the power dissipated is the current times VDS as well as the power dissipated by a transistor is the current times VCE.
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