Inductors Oppose

Inductors react against changes in current by dropping voltage in the polarity necessary to oppose the change. The only opposition to the flow of current is the resistance of the wire from which the coil is made.

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When an inductor is faced with increasing current it acts as a load.

Inductors oppose. The capacitor and inductor are both electrical components used to oppose changes in current in the electrical and electronic circuits. These components are passive elements which draw power from the store circuit and then discharge. An inductor is a passive component that exhibits significant inductance l.

Hence an inductor opposes change in current. Hence an emf is induced inside the inductor called as self induced emf. That is the flux linkage of the inductor with itself is changed.

Alternating current flowing through a coil is opposed by two factors resistance r and inductive reactance xl. As a result inductors oppose any changes in current through them. This self induced emf will oppose its cause so its polarity is opposite to that of the source voltage which is change in current.

The magnetic field produced around each wire loop of the inductor by the current flow in the wire itself will oppose any change in rate or direction of current flow in the wires of the inductor. In other words inductors resist or oppose changes of current but will easily pass a steady state dc current. Inductance is defined as the property of a circuit to oppose changes in current.

Capacitance is the property of a circuit to oppose changes in voltage. This opposition starts upon the initial application of voltage to the inductor and is very substantial at that time. In the international system of units si the unit of inductance is the henry h named for 19th century american scientist joseph henry.

This ability of an inductor to resist changes in current and which also relates current i with its magnetic flux linkage nf as a constant of proportionality is called inductance which is given the symbol l with units of henry h after joseph henry. When a time change in the main current takes place a counter voltage develops across the inductor. Dropping voltage as it absorbs energy negative on the current entry side and positive on the current exit side like a resistor.

An inductor is characterized by its inductance which is the ratio of the voltage to the rate of change of current.

Fowler Chapter 11 Lecture 11 Inductance Inductance Chapter