Baisc Electrical Installation Work
204
Capacitors may connected across the main busbars industrial loads
in order provide power factor improvement, but smaller capacitors may
also connected across individual piece equipment, the case
for fluorescent light fittings.10, mag-
netic field will become established the core when current flows the
coil due the switch being closed. The basic
rules magnetism were laid down Chapter this book. Here will
look some the laws magnetism they apply electrical machines,
such generators, motors and transformers.9
Power factor improvement using capacitors.
A current carrying conductor maintains magnetic field around the
conductor which proportional the current flowing. This basic principle laid down the laws present-
day electricity generation where strong magnetic field rotated inside a
coil wire generate electricity. 10. When this mag-
netic field interacts with another magnetic field, forces are exerted which
describe the basic principles electric motors.
(a)
I Load
V
1
Ic
I Load
V
(b)
2
Ic
V
(c)
I Load ‘in phase’
.
Self and mutual inductance
If coil wire wound iron core shown Fig.
Michael Faraday demonstrated August 1831 that electricity could
be produced magnetism. stated that ‘when conductor cuts is
cut magnetic field emf induced that conductor. The amount
of induced emf proportional the rate speed which the magnetic
field cuts the conductor’.
FIGURE 10.
Electrical machines
All electrical machines operate the principles magnetism
