4
Electrical machines energy converters.
between the north and south poles.5 are replaced single split ring, called com-
mutator, the generated emf will seen one direction, shown
in Fig. However,
.6.
Definition
Faraday’s law which states that when
a conductor cuts cut mag-
netic field, emf induced that
conductor.c.Basic Electrical Installation Work
92
Cathode
ray
oscilloscope
Rotation
N
S
Carbon brushes
Slip rings
FIGURE 4. generator dynamo
If the slip rings Fig.
Simple d. generator alternator.
Electrical
energy
output
Mechanical
energy
input
Generator
(a)
Electrical
energy
input
Mechanical
energy
output
Motor
(b)
FIGURE 4. Alternately changing, first positive and then
negative, then positive again, giving alternating output. the gen-
erated emf collected carbon brushes the slip rings and displayed
on the screen cathode ray oscilloscope, the waveform will seen to
be approximately sinusoidal. 4. 4. This flux cutting will induce emf
in the wire Faraday’s law which states that when conductor cuts or
is cut magnetic field, emf induced that conductor. The action the commutator reverse the generated emf
every half-cycle, rather like automatic change-over switch.c.5
Simple a
