Voltage drop describes how the supplied energy of a voltage source is reduced as electric current moves through the passive elements (elements that do not supply voltage) of an electrical circuit. Voltage drops across internal resistances of the source, across conductors, across contacts, and across connectors are undesired; supplied energy is lost (dissipated). The voltage drop of any insulated cable is dependent upon the cable length (in meters), the required current rating (in amperes), and the relevant total impedance per unit length ... Read more