Get premium membership and access revision papers with marking schemes, video lessons and live classes.
OR

# Form 4 Physics: Electromagnetic induction online video lessons

Applications of electromagnetic induction

(5m 10s)
225 Views     SHARE

In an external circuit the current is at maximum value at 90^0 and minimum value at 270^0. This brings about alternating current and the corresponding voltage (e.m.f) is the alternating voltage.
2. D.c generator/alternator– in this case the commutators replaces the slip rings to enable the output to move in one direction. After a rotation of 180^0, instead of current reversing, the connections to the external circuit are reversed so that currentdirection flows in one direction.