Andre

N channel JFETS & MOSFETS  work pretty much as per bipolars (nomally off).

 P channel versions work the way you have described.

 The only proviso is that MOSFETS (especially)  have such a high
internal leakage resistance that they can retain enough charge to be
"ON" if there is no additional pulldown resistor. So if you measure
them with a multimeter, they may be conducting "out of the box".

RP

2008/6/26 Andre Abelian <aabelian@mason-electric.com>:
> Hi to all,
>
> Based on my understanding bipolar transistors pnp or npn they are
> normally off until apply voltage to the base to turn it on but FET
> transistors are opposite they are normally on until apply power to the
> Gate and Source to turn it off. My question is: Are all FET, JFET,
> MOSFET and etc FET transistors work the way I described above or I
> misunderstood?
>
>
> Any feedback will appreciate.
>
> Thanks
>
> Andre
>
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