Basic of Electrical Engineering

State the difference between generator and alternator
Generator and alternator are two devices, which converts
mechanical energy into electrical energy. Both have the same
principle of electromagnetic induction, the only difference is
that their construction. Generator persists stationary magnetic
field and rotating conductor which rolls on the armature with
slip rings and brushes riding against each other, hence it
converts the induced emf into dc current for external load
whereas an alternator has a stationary armature and rotating
magnetic field for high voltages but for low voltage output
rotating armature and stationary magnetic field is used

difference between generator and alternator Generator and alternator are two devices, which converts mechanical energy into electrical energy. Both have the same principle of elect...

Why back emf used for a dc motor? highlight its significance?
The induced emf developed when the rotating conductors of
the armature between the poles of magnet, in a DC motor,
cut the magnetic flux, opposes the current flowing through
the conductor, when the armature rotates, is called back
emf. Its value depends upon the speed of rotation of the
armature conductors. In starting, the value of back emf is
zero.

Why back emf used for a dc motor? highlight its significance? The induced emf developed when the rotating conductors of the armature between the poles of magnet, in a DC motor, cut the magnetic flux...