I have built a test circuit to test powering a DC motor through a 30N06 N-channel MOSFET
When running a 5V 1A power supply (bench supply) through the MOSFET, and touching the gate from GND to the 5V supply, I see that 1A of current flows through the MOSFET as expected:
At this time, I can see that the resistance of the drain -> source is showing as maxed on my multimeter when gnd is applied to the gate, and 0 ohms when the 5V is applied to the gate (again as expected.)
When I put the DC motor after (or before) the MOSFET in the flow of current, the amount of current that flows drops to ~0.47A:
Additionally, when checking the resistance of the MOSFET in this case I am seeing maxed measurement (maximum resistance from the MOSFET) while the motor is being powered, and seeing 0-20k ish ohms when gate is driven to GND.
When the motor is given the 5V 1A source directly, 1A flows through the motor and it spins far faster:
I am very confused as to why this might be. My expectation from both testing without a load and from educational material is that it should drop to near-zero resistance and allow the full 1A to flow through the motor.
The MOSFET is not getting warm. I've also tried with connected a 100k and 1m ohm resistor between gate and source, no difference.
Note that this circuit is not my final circuit and was just a test for making sure that I can control the motor with a MOSFET.