Inductor

If the inductor does have initial current, it can be represented by: * adding a voltage source in series with the inductor, having the value: : where : is the inductance, and : is the initial current in the inductor.

A few types: :*Tank coil - an inductor used in a tuned circuit :* Choke - an inductor used to block high frequency AC while allowing through low frequency AC.

Constitutive equation Any change in the current through an inductor creates a changing flux, inducing a voltage across the inductor.

For example, an inductor with an inductance of 1 henry produces an EMF of 1 volt when the current through the inductor changes at the rate of 1 ampere per second.

For sinusoids, as the voltage across the inductor goes to its maximum value, the current goes to zero, and as the voltage across the inductor goes to zero, the current through it goes to its maximum value.

In general if one decides to find the energy stored in a LTI inductor that has initial current in a specific time between and can use this: : Q factor An ideal inductor would have no resistance or energy losses.

The energy from the external circuit necessary to overcome this potential "hill" is being stored in the magnetic field of the inductor; the inductor is said to be "charging" or "energizing".

The magnetic field between a white dwarf and an orbiting planetary core can form a unipolar inductor circuit, with the core acting as a conductor due to its metallic constituents.

A constant direct current has a zero rate-of-change, and sees an inductor as a short-circuit (it is typically made from a material with a low resistivity ).

A double-conversion UPS with an insulated-gate bipolar transistor rectifier and inductor can have a THD I as small as 2%.

Also, phasor analysis of circuits can include Euler's formula to represent the impedance of a capacitor or an inductor.

An inductor may radiate electromagnetic energy into surrounding space and circuits, and may absorb electromagnetic emissions from other circuits, causing electromagnetic interference (EMI).

Article on inductor characteristics and modeling.

As said in the class-D amplifier, the transistor is connected via a serial LC circuit to the load, and connected via a large L (inductor) to the supply voltage.

At increasing frequency, on the other hand, the reactance increases and at a sufficiently high frequency the inductor approaches an open circuit.

At low frequency the reactance falls, and for a steady current (zero frequency) the inductor behaves as a short-circuit.

Class F can be driven by sine or by a square wave, for a sine the input can be tuned by an inductor to increase gain.

Deriving the device-specific impedances What follows below is a derivation of impedance for each of the three basic circuit elements: the resistor, the capacitor, and the inductor.

Ferromagnetic core inductor A variety of types of ferrite core inductors and transformers Ferromagnetic-core or iron-core inductors use a magnetic core made of a ferromagnetic or ferrimagnetic material such as iron or ferrite to increase the inductance.

For example, if a capacitor has an initial voltage across it, or if the inductor has an initial current through it, the sources inserted in the s -domain account for that.