Glossary of Terms




— the ability of a system or unit to store an electric charge and is measured in F (reads as farad) or uF (reads as microfarad) for common motor run and motor start capacitors


— a passive electrical component that stores energy; most common capacitor units are measured in uF (reads as microfarad)


— flow of electric charge often carried by moving electrons in a wire, by ions in electrolyte, or by both ion and electrons such as in a plasma


— a medium or substance (typically plastic or paper) that transmits electric force without conduction

Dissipation Factor

— measured in percent; also called as loss tangent, is defined as the ratio of Equivalent Series Resistance (ESR) and capacitive reactance


— number of complete cycles per unit time and also the rate of alternation in an AC current; usually expressed in cycles-per-second or Hertz (Hz)

Insulation Resistance

— measured value to indicate the condition of the insulation or dielectric resistance between two conductive parts wherein higher measured value indicates better condition of insulation


— substance or material usually used as coolant or dielectric fluids that are free of harmful and environmentally toxic Polychlorinated Biphenyls (PCB)


— designate the electric pressure that exists between two points and is capable of producing a current flow when a closed circuit is connected between the two points