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# ch3 - Electricity And Electronics Fundamentals TECH 175...

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1 Electricity And Electronics Fundamentals TECH 175 Fall Semester 2007 Chapter 3 Basic Electrical Circuit Materials 3 Conductors Materials with a large numbers of free electrons Excellent conductors – Silver – Gold – Copper – Aluminum 4 Semiconductors Neither good conductors nor good insulators Silicon and germanium – Primary materials in semiconductor devices – Used to make transistors, diodes, and integrated circuits 5 Conductance • Conductance – Measure of a material’s ability to allow flow of electrical current – Reciprocal of the resistance – G = 1/R Unit of conductance – Siemens (S) 6 Lesson in Safety Human body is a good conductor of electricity Never touch a circuit conductor or component unless you are sure that it is not energized Technicians who work on high voltage lines work in insulated bucket trucks or on insulated platforms

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2 7 Conductor Sizes Conductors are sized by their cross- sectional area The amount of cross-sectional area of a conductor determines how much current it can handle without overheating American Wire Gauge is primary system to denote wire diameters The higher the AWG number, the smaller the diameter 8 Circular Mils • Mils – One mil is equal to 1/1000 th of an inch
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ch3 - Electricity And Electronics Fundamentals TECH 175...

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