Inductor is a passive electronic component that storesenergy in
the form of a magnetic field. In its simplest form, an inductor
consistsof a wire loop or coil. The inductance is directly
proportional to the number ofturns in the coil. Inductance also
depends on the radius of the coil and on the type of material
around which the coil is wound. An "ideal inductor" has
inductance, but no resistance or capacitance, and does not
dissipate or radiate energy. A real inductor may be partially
modeled by a combination of inductance, resistance (due to the
resistance of the wire and losses in core material), and
capacitance. At some frequency, some real inductors behave as
resonant circuits (due to their self capacitance). At some
frequency the capacitive component of impedance becomes
dominant. Energy is dissipated by the resistance of the wire,
and by any losses in the magnetic core due to hysteresis.
Practical iron-core inductors at high currents show gradual
departure from ideal behavior due to nonlinearity caused