INDUCTORS

Inductors are usually made with coils of wire. The wire coils are wound around iron cores, ferrite cores, or other materials except in the case of an air core inductor where there is no core other than air. The inductor stores electrical charge in magnetic fields. When the magnetic field collapses it induces an electrical charge back into the wire. Inductors are associated with circuit capacitance and can form a tuned circuit and resonate at a particular frequency. Two coils close to one another, as they are in a transformer, literally transfer charge from one coil to the other. This is called mutual inductance.
Inductor Calculators:
Inductor CalculatorSMIrC Laboratory - Spiral Inductor CalculatorShavano Music Online - Cross-Over Network; Air Core InductorJim Hawkins' Java Radio CalculatorsInductor CalculatorRF Cafe - Inductor Calculator SpreadsheetDC Choke Design CalculatorThe educational encyclopedia, datasheetsCircuit Sage: Inductor Tools and LinksThe Engineers' Club Online Service - Engineering Calculators