1
Atoms and electrons material.1(b), the free
electrons drift purposefully one direction only.
Good insulating materials are PVC,
rubber, glass and wood. The
electrical properties material depend largely upon how tightly these
electrons are bound the central nucleus.1(a).Basic electrotechnical units and theory
81
Basic circuit theory
All matter made atoms which arrange themselves regular
framework within the material.
Table 4. 4.1(a).
Definition
An insulator material which the
outer electrons are tightly bound to
the nucleus, there are free elec-
trons move around the material. The atom made central, posi-
tively charged nucleus, surrounded negatively charged electrons.
Good insulating materials are PVC, rubber, glass and wood. For each electron entering the positive terminal the battery, one will
.
A conductor material which the electrons are loosely bound the
central nucleus and are, therefore, free drift around the material ran-
dom from one atom another, shown Fig. Materials which are good
conductors include copper, brass, alu-
minium and silver. 4.2 Symbols and Multiples for Use with Units
Prefix Symbol Multiplication
factor
Mega 106
or 1,000,000
Kilo 103
or 1000
Hecto 102
or 100
Decca 10
Deci 101
or ÷10
Centi 102
or ÷100
Milli 103
or ÷1000
Micro 106
or ÷1,000,000
An insulator material which the outer electrons are tightly bound
to the nucleus, there are free electrons move around the material. The free electrons close
to the positive plate the battery are attracted since unlike charges
attract, and the free electrons near the negative plate will repelled from
it. 4.
Definition
A conductor material which the
electrons are loosely bound the
central nucleus and are, therefore, free
to drift around the material random
from one atom another, shown
in Fig. Materials which are
good conductors include copper, brass, aluminium and silver.
(a)
(b)
Atoms
Electron movement
FIGURE 4.
If battery attached conductor shown Fig
