Resistance between the voltage source and the load can lead to a voltage drop in wiring. A poor connection, corrosion, the type of wire, the diameter or gauge of the wire, and the distance between the source and the load all can cause resistance in wiring.
Voltage drop in an electrical system can prevent circuits from working properly. Voltage drops along a ground path in an electrical system can cause the entire system to experience problems. Excessive voltage drop could damage electronic components and may pose a safety or fire risk as well. For example, household electrical circuits usually run between 110 and 120 volts, and dropping below this voltage occasionally damages an appliance. Though motors still can stall out even there is a voltage drop, the damage it cause needs more expensive repairs. That’s why some induction motors increase the current draw to maintain their power output in the event of a voltage drop. Because electrical wiring can only handle a set amount of current, exceeding this causes the appliance to burn out if not addressed.