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.

Testing the voltage drop on the ground side of the starter circuit is straightforward. We’ve simulated this test on the bench showing the starter, battery, and cables.

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 ...