Torque

• Torque is the rotational analogue of linear force. When a lever arm is set in motion by forces that act perpendicularly to both the lever arm and the body that the lever arm is attached to, a torque is made and this causes the body to spin. In the case of a motor, the rotating body is the shaft.
  
  

Speed

• Rotational speed, like torque, takes a form that is similar to speed in linear motion. Instead of feet per second, it quantifies the angle subtended per second of the motion. Angular velocities of automobile motors are given in rotations per minute (RPM).
  
  

Power

• A calculation of motor power is straightforward once the torque rating and the angular velocity have been determined. The power (P) of a motor equals the product of the torque (T) and the angular velocity (w): P = Tw.