Voltage is a lot like water pressure, and a vehicle’s bulbs, motors, pumps, injectors and other devices that perform work need a proper supply delivered to them.

Diagnose electrical problems by chasing voltage drops, instead of the old-fashioned way -- checking continuity. Including Mike Allen's Physics 101 introduction to Ohm's law.

Inevitably, industrial facilities are going to have 460VAC, 3-phase motor loads. And, of course, since voltage drop is considered mainly a performance issue, maximum voltage drop rules on a circuit ...