The magnetic flux is therefore given by Φ=B×A with A being the cross-section of the wire loop. Where μ 0=4π×10 -7 H/m is the magnetic permeability of vacuum. The expression of the magnetic field B is given by the following Equation 1 : eq 1 : Expression of the magnetic field within a single-wire When the current I i flows as shown in Figure 1, the induced magnetic field is directed upwards, which is specified by the circle with a dot. The circle with a cross denotes that when the current I flows as drawn in Figure 1, the magnetic field is directed downwards.Īccording to Lenz’s law, if the current is of AC form, B is as well alternating, which creates an induced current I i, generated by an electromotive force E, in order to moderate the variation of the magnetic field with an induced field B i. The current loop formed by the circuit creates a magnetic field B when a current I, generated by an AC source, flows into it. In order to understand this definition better, let’s consider a circuit that consists of an AC source and no other components other than a conductive wire of length l shorting the source as shown in Figure 1 below : fig 1 : AC source applied to a single-wind wired This moderation of the current can be explained by the electromagnetic law of induction that has been detailed in the tutorial about AC resistance. The inductance, is a property of an electrical component that consists of creating an opposition to the variation of the current when an alternating voltage is applied to its terminals.
We explain as well why certain type of inductors are better suited for high frequency applications.Ī second section highlights the dependence with the frequency of the inductance and phase shift observed in them.įinally, a last section deals with the association of resistor and inductor in order to create filtering circuits. A description of inductors is also given later in this same section.
However, other basic electrical components such the inductor, strongly depends on the frequency of the AC signal.Ī presentation of the concept of inductance is given in a first section in order to understand the phenomena that dictates how inductor works. In the previous tutorial concerning AC resistance, we have seen that the behavior of a resistor is the same in DC or AC regime under normal frequencies.
0 kommentar(er)
