when a current flows through a conductor, a magnetic field builds up around the conductor. This field contains energy and is the
foundation for inductance.
PRINCIPLES OF INDUCTANCE
Inductance is the characteristic of an electrical conductor that opposes a change in current flow. The symbol for inductance is L. An inductor is a device that stores energy in a magnetic field.
Inductors are devices designed to have a specific inductance. They consist of a conductor coiled around a core and are classified by the type of core material—magnetic or nonmagnetic.
L/R TIME CONSTANTS
An L/R time constant is the time required for current through a conductor to increase to 63.2% or decrease to 36.8% of the maximum current.