At DC, the bottom circuit will look like a 1 kΩ resistor along with whatever resistance ... the circuit might as well be an open circuit. In between, the resistance will increase with frequency.

You open the FET by charging and discharging ... if the gate isn’t being actively pulled into any direction. See the R1 resistor in the intro circuit? It keeps the gate discharged and the ...

When resistors are connected in series, the current through each resistor is the same. In other words, the current is the same at all points in a series circuit. When resistors are connected in ...