The circuit must be active. Turn on the switch to command current through the wire or component you are testing.
Resistance is the opposition to flow. Every load in a circuit—like a bulb or a motor—is a intentional restriction designed to convert electrical energy into useful work. However, unintentional resistance caused by corrosion, loose terminals, or broken wire strands drops voltage prematurely. This unwanted resistance is the root cause of most electrical failures. The Gold Standard: Voltage Drop Testing fundamental electrical troubleshooting dan sullivan
