Increasing Current in Coil

线圈中电流增加

Increasing current in a coil of wire will generate a counter emf which opposes the current. Applying the voltage law allows us to see the effect of this emf on the circuit equation. The fact that the emf always opposes the change in current is an example of Lenz's law.

增加线圈中的电流会生成一个反电动势，该电动势会抵消电流。应用电压定律可以让我们看到这个电动势对电路方程的影响。电动势总是抵消电流变化这一事实是法拉第电磁感应定律的一个例子。

The relation of this counter emf to the current is the origin of the concept of inductance. The inductance of a coil follows from Faraday's law.

这个反电动势与电流的关系就是感应电感概念的起源。线圈的电感性由法拉第定律得出。

Transient behavior of coil

线圈的暂态行为

Index

Faraday's law concepts

Inductance concepts

索引：法拉第定律概念，电感概念

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Inductance of a Coil

线圈的电感

Coil's reaction to increasing current

线圈对电流增加的反应

For a fixed area and changing current, Faraday's law becomes

Since the magnetic field of a solenoid is

then for a long coil the emf is approximated by

From the definition of inductance

we obtain

对于固定面积和变化的电流，法拉第定律变为。由于螺线管的磁场则为，对于长螺线管，感应电动势可近似表示为。从自感的定义我们得到

Inductance of a solenoid

螺线管的电感

Index

Inductance concepts

AC Circuits

索引电感概念交流电路

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