iron
silicon steel
high carbon steel
stainless steel
two
four
equal to the no. of poles
one
steady d.c.
steady a.c.
pulsating a.c.
pulsating d.c
no effect takes place
current flow is stopped
The direction of current flow is reversed
the magnitude of current flow is decreased
rotating magnetic field past stationary coils
relative motion between the field and the armature coils
converting electrical energy into mechanical energy
rotating the coils around a magnetic field