A real understanding of electricity enables the technician to troubleshoot intelligently, and is an essential part of set safety—for you, and for all those you work with. In this chapter, we start with the principles of how electricity works. We want to build a mental picture of how electrical forces behave; how current, voltage, power, and resistance are related; and how these relationships translate to our daily work. We need to understand the parts that make up a safe circuit—how switches, overcurrent protection, and grounding help keep a system safe. We'll discuss single-phase and three-phase alternating current (AC) power systems, and their associated voltage configurations. Woven throughout this conversation ...

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