Study Unit Understanding and Using Electronic Diagrams

Study UnitUnderstanding andUsing ElectronicDiagramsByThomas GregoryIn your studies so far, you ve learned the basic principles ofhow electrical circuits provide power for useful work. Basiccircuits consist of a power source, components that regulatethe flow of current, and loads such as motors, lights, heat-ers, and more complex devices like computers or and Electronic technicians may work installing,servicing, maintaining, and troubleshooting hundreds of dif-ferent electrical and electromechanical devices from manydifferent manufacturers, on a regular basis. Over the years astandard visual language has evolved that allows designers,engineers, and technicians to effectively describe these elec-trical devices functions. In this unit you ll learn how circuits are described by draw-ings called schematics. These drawings use standard symbolsthat allow technicians to quickly understand how a circuit isconstructed, what function it performs, and how to trouble-shoot the equipment.

voltage of 120 volts, so the step-down transformer in Figure 1 has a turns ratio of 120 V/18 V = 6.67:1. Since the second-ary voltage is 18 volts and the maximum current is 2 amps, you know that the maximum volt-amp (VA) rating of the transformer is 18 V 2 A = 36 VA. A replacement trans-former would need to have the same secondary voltage, but

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