# Inductor

An inductor (also choke, coil or reactor) is a passive two-terminal electrical component that stores energy in its magnetic field. For comparison, a capacitor stores energy in an electric field, and a resistor does not store energy but rather dissipates energy as heat.

Any conductor has inductance. An inductor is typically made of a wire or other conductor wound into a coil, to increase the magnetic field.

When the current flowing through an inductor changes, a time-varying magnetic field is created inside the coil, and a voltage is induced, according to Faraday's law of electromagnetic induction, which by Lenz's law opposes the change in current that created it. Inductors are one of the basic components used in electronics where current and voltage change with time, due to the ability of inductors to delay and reshape alternating currents.

### Other articles related to "inductor":

Inductor - Inductance Formulae
... The table below lists some common simplified formulas for calculating the approximate inductance of several inductor constructions ... Construction Formula Dimensions Notes Cylindrical air-core coil L = inductance in henries (H) μ0 = permeability of free space = 4 × 10−7 H/m K = Nagaoka coefficient N = number of turns A = area of cross-section of the coil in square metres (m2) l = length of coil in metres (m) Straight wire conductor L = inductance l = cylinder length c = cylinder radius μ0 = vacuum permeability = nH/cm μ = conductor permeability p = resistivity ω = phase rate exact if ω = 0 or ω = ∞ L = inductance (nH) l = length of conductor (mm) d = diameter of conductor (mm) f = frequency Cu or Al (i.e ...
Dot Convention - Sinusoidal AC
... "Into" meaning from the dot toward the inductor, and conversely "out" meaning from the inductor toward the dot ... A current going into a dotted terminal of the inductor induces a voltage which is in phase at the other dot ...
Buck–boost Converter - Non-ideal Circuit - Effect of Parasitic Resistances
... the sake of simplicity, we consider here that the inductor is the only non-ideal component, and that it is equivalent to an inductor and a resistor in series ... This assumption is acceptable because an inductor is made of one long wound piece of wire, so it is likely to exhibit a non-negligible parasitic resistance (RL) ... Furthermore, current flows through the inductor both in the on and the off states ...
MRUD
... The MRUD kit comes packed with a manual inductor, circuit test device and an EK-40-69 electric detonator ... The mine can be command detonated from up to 30 meters away using a manual inductor or another electrical power source ... canvas shoulder bag which also contains the firing cable a circuit tester and a manual inductor ...
Choke (electronics)
... is a coil of insulated wire, often wound on a magnetic core, used as a passive inductor which blocks higher-frequency alternating current (ac) in an electrical circuit while passing signals of much lower ... It is a functional name the same inductor is often called a “choke” if used to block higher frequencies, but a “coil” or “inductor” if, say, part of a tuned circuit ...