4 Materials and their
applications in the
At the end of this chapter you should be able to:
Compare aluminium and copper as conductor materials.
Explain the effect on
tables to determine
sizes for specified
the construction of printed
need to limit the current density in the conductors.
Explain why heat sinks are necessary for many
Explain why dielectrics fail in service.
core losses occur in iron-cored coils
Compare the properties of permanent magnet steels with those of
soft ferro-magnetic materials.
properties for core
for use with a
The best electrical conductor known is silver but this is far too
expensive and rare to provide all the conductor material required by
the electrical industry. Next in order of conductivity come copper
and aluminium and these are the most important current carrying
materials used in cable and line manufacture. Other