Here the gate voltage is 5V and lots of the 12V input voltage stays across drain and source.
Here the gate voltage is 12V and still some voltage stays across drain and source but this time smaller.
I knew that gate voltage just opens the path between drain and source making them act as short circuit. But here, I saw that
1) Apparently drain to source is not short circuted because there is some voltage drop in both cases. Why voltage drops across drain and source?
2) Why applying 5V or 12V to gate makes a difference? Isn't only job of gate voltage is to open/close the drain-source connection?
p.s : both are simulation results using proteus.