given a circuit, as Bob described where the drain is the supply side, and
the source has the load, for an N channel device would this ever really work
since the Vgs that needs to be asserted for full turnon is
being adjusted because as the voltage on the gate increases the voltage on
the source will slowly rise.

I put a circuit together using a IRLR3714, and even at 5V on the gate, could
only get a little over 2V on the load using 4.5V on the drain connection.

Did I miss something on the interpretation ?

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