It is called a motor unit.
what is a fixed position and vibrate on the spot
It is not fixed in the atmosphere. It moves as part of the carbon cycle in and out of the oceans, the atmosphere and the land.
It is called a motor toboggan.
energy levels
The rubber part is called an isolater.
Armature current is the current flowing in a motor's armature. The "armature" is another name for the coil (or coils) of wire which are on the motor's "rotor", which is the part that rotates inside its stator. (The "stator" is the fixed, non-rotating part of the motor.)
Because it steps the shaft by a fixed number of degrees each time it is actuated.
The part that rotates inside of an electric motor is called the rotor.
If its the spining part its called a rotor, if its the stationary part its called a stator.
The part that rotates inside of an electric motor is called the rotor.
A fixed location in a space is called a fixed star.
Surging is often fixed by replacing the fuel filter. A simple job and most small engine shops will have the part.
Motor brushes ride one the commutator.
I'm not sure what nuclei would do that. If you mean cellular nuclei then it would be the nuclei in the soma on the motor neuron. But, if you are asking about motor coordination, that is controlled by a part of the brain called the cerebellum.
It depends on what needs to be fixed and who's fixing it.
Purchasing of motor vehicle is example of fixed cost while using fuel for running those motor vehicles is a variable cost.