Handbook 652 Body Electrical Diagnosis Measuring Voltage Drop Voltage drop is measured with current flowing. The measurement is taken between the power side and the ground side of the component (or series of components) being tested. Understanding Voltage In a normally operating circuit, the loads consume most of the available voltage. If the circuit has an unwanted high resistance, however, the high resistance will consume part of the available voltage, and the loads will use up the remainder. This will result in a lower-than-normal voltage drop across the loads, and a higher-than-normal voltage drop elsewhere in the circuit. Drops Technical Training 21