Engineering materials have electrical properties which is their ability to permit or resist the flow of electricity through them. These properties could be sub-divided into restivity,conductivity, temperature coefficient of resistance, dielectric strength and thermoelectricity.
(1.) Resistivity: This the electrical property of a material due to which it opposes the flow of electricity through it. It is given by
Resistivity, P = R.A/l
(2.) Conductivity: This is the reciprocal of resistivity.
(3.) Temperature coefficient of resistance: This is the variation of resistivity with temperature.
(4.) Dielectric strength: is the insulating capacity of a material against high voltages.
(5.) Thermoelectricity: This is when a small voltage is produced as a result of heating 2 different metals together.
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