This is called reluctance R (in H -1).Īs air has high reluctance these types of inductors are used in high-frequency RF circuits where a low value of inductance is required. Air does not provide the flow of magnetic lines freely, rather opposes the flow of the line. Air CoreĪs the name suggests, these have only air in the core of their winding. There are different types of inductors available based on their geometrical shape and type of core used. Like other discrete components resistor and capacitor, we can connect Inductors in series and parallel too. How much is one Henry?Īn inductor has an inductance ( L) of 1 Henry if the EMF ( ε) induced in it is 1 Volt when the current is changing at the rate of one ampere per second ( dI/dt). Where X L is inductive reactance in ohms, f is the frequency in Hz, and L is inductance in Henry. The opposition, resistance, to the induced current, induced by the magnetic field is called Inductive reactance and given by : Kindly note that, the negative sign which indicates the EMF is of opposite polarity to the applied voltage. Where ε is the electromotive force in volt, L is the inductor value in Henry and dl/dt is the rate of change of current with respect to time. This change in flux, induces an electromotive force (EMF) in the inductor which is given by :
Any change in the electric current induced, changes the flux. Now let us continuously turn on and off the switch S, this is similar to applying alternating current.
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