In Electronics, the Equivalent Series Inductance (ESL, the "L" is the symbol for inductors) describes the parasitic inductance found in real capacitors (symbol "C"), modeled as a inductance in series to an ideal capacitor. Two digital voltmeters The field of electronics is the study and use of electrical devices that operate by controlling the flow of electrons or other electrically charged particles in devices such as thermionic valves and semiconductors. ... A parasite is an organism that lives in or on the living tissue of a host organism at the expense of it. ... Various types of capacitors A capacitor (occasionally referred to using the older term condenser) is a device that stores energy in the electric field created between a pair of conductors on which equal but opposite electric charges have been placed. ...

Ideally, a capacitor's impedance falls with the frequency at 20dB/decade. However, due partly to the inductive properties of the connections, and partly to non-ideal characteristics of the capacitor material, real capacitors also have inductive properties whose impedance rises with the frequency at 20dB/decade. At the resonance frequency the sum of both is minimal, above it the parasitic inductance of the capacitor dominates. In electrical engineering, impedance is a measure for the manner and degree a component resists the flow of electrical current if a given voltage is applied. ...

See also: Capacitor Various types of capacitors A capacitor (occasionally referred to using the older term condenser) is a device that stores energy in the electric field created between a pair of conductors on which equal but opposite electric charges have been placed. ...