I am trying to drive a 12V motor that has max amps of 15amps. I am using MOSFET RFP30N06LE. Can someone explain to me why these are used for motor control when they control the current? When I use my circuit below, turning the gates on using TTL 5v from an Arduino my voltage on the 12v circuit drops dramatically and the motor barely turns. What am I doing wrong? These are TTL MOSFETS from my understanding.