EquivalentsHenry

EquivalentsHenry is a term used in electrical engineering to denote the effective inductance of an electrical network as seen from a specified port, expressed in henries. It is a descriptive, nonstandard label that mirrors the familiar idea of an equivalent resistance or Thevenin impedance, but specifically focused on inductive storage and dynamic response.

Definition and scope

EquivalentsHenry represents the net inductance that a circuit presents to an external excitation under prescribed conditions, such as a particular frequency or transient moment. The value can depend on how the network is connected, which ports are observed, and whether mutual inductance between elements is significant. In simple cases, it serves as a single-parameter surrogate for more complex inductive behavior.

Calculation and properties

For basic arrangements, standard rules apply: in series, L_eq equals the sum of the individual inductances; in parallel, 1/L_eq equals the sum of the reciprocals (assuming negligible mutual coupling). When mutual inductance is present, the calculation uses the inductance matrix or coupling coefficients, and the resulting L_eq may depend on frequency and coil orientation. Because the port choice can influence the observed inductive response, different equivalent values can exist for different measurement setups. Thus, equivalentsHenry is a helpful, but not unique, descriptor tailored to a specified analysis context.

Applications

EquivalentsHenry is used to simplify complex networks in design and analysis, enabling quicker estimation of transient and AC behavior, such as in filter design, power electronics, and energy storage studies. It aids in communicating the effective inductive effect of a network without detailing every constituent component.

See also

Henry (unit), inductance, equivalent circuit, impedance, mutual inductance.