The motor effect is the term used when a current-carrying wire, in the presence of a magnetic field, experiences a force.
This can be demonstrated easily in a simple school experiment. Place a thin aluminium strip in between two opposing magnets.
Apply an electric current through the aluminium foil.
You can see the aluminium strip move and, using Fleming's left-hand rule (used when electricity passes through a wire), you could have predicted it.
To be able to recall the meaning of "motor", remember the following:
This motor effect can be used to drive a motor
See the definition of motors.
This effect is used to drive electric motors, even cars.