How DC motor prodeuces back emf? How ammeter work? Range extention method.

Question

Accepted Answer

DC motors produce back EMF through the interaction of the magnetic field and the rotating armature.

Back EMF is generated when the armature of a DC motor rotates within a magnetic field.
The back EMF opposes the applied voltage and is proportional to the speed of the motor.
Back EMF is important for motor control and can be used to estimate motor speed.
Ammeters measure the current flowing through a circuit.
They are connected in series and have a low resistance to minimize voltage drop.
Range extension method involves using additional resistors or shunt resistors to expand the measurement range of an ammeter.