Current flowing through the inductor creates a magnetic field,

以及磁場不善於改變。

and magnetic fields do not like to change.

結果，電感器會是一種裝置試圖

As a result, an inductor is a device which tries to

防止流過它的電流產生變化。

prevent the current flowing through it from changing.

如果流過電感的電流量固定(沒有變化)，

If the amount of current flowing through the inductor is constant,

感應器會很高興，並且不會製造產生任何力量

the inductor will be happy, and it will not generate any forces

在流過它的充電粒子上。

on the charged particles flowing through it.

在這樣的情形下，電感器的作用就像正常的導線一樣。

In this case, the inductor behaves just like a normal wire.

另一方面，

On the other hand,

如果我們試著中斷電流流過此電感，

if we try to interrupt the current flowing through the inductor,

電感器將產生一種吸力，試圖使電流流過它。

the inductor will generate a force, trying to keep the current flowing through it.

如果電感連接其自身，並且沒有電阻在電路之中，

If an inductor is connected to itself, and there is no resistance in the circuit,

照理說，電流將永遠持續流通。

the current will theoretically continue circulating forever.

然而，除非我們使用超導體，

However, unless we are using superconductors,

所有電線都對其有阻力

all wires have some resistance to them,

最後電流將衰減為零。

and the current will eventually decay to zero.

電阻越大，電流衰減越快。

The larger the resistance, the faster the current will decay.

但是，電感器的電感值越大，電流衰減越慢。

But, the larger the inductance of the inductor, the slower the current will decay.

一旦電流為零，電感器則希望將電流保持為零，

Once the current is at zero, the inductor will want to keep the current at zero,

基於這樣的事實情況，故電感器試圖

due to the fact that an inductor tries to

防止流過它的電流發生變化。

prevent the current flowing through it from changing.

因此，當我們連接此電感器到電路時，

Therefore, when we connect this inductor to a circuit,

感應器最初會產生力量

the inductor will initially create a force

試圖防止通過它的電流增加。

trying to prevent the current through it from increasing.

但是，電流將會慢慢遞增。

But, the current will slowly increase.

電感器的電感值越大，

The larger the inductance of the inductor,

則電流將增加越慢。

the slower the increase in current will be.

在電流停止增加並達到定值之後，

After the current has stopped increasing and has reached a steady value,

然後感應器將再次感到高興，並且不會產生任何力量。

the inductor will then again be happy, and not generate any forces.

但是，當我們嘗試關閉流經電感器的電流時，

But, when we try to turn off the current flowing through the inductor,

然後，電感器將產生力以嘗試

the inductor will then generate a force to try to

使流過它的電流保持在這個新的定值。

keep the current flowing through it at this new constant value.

如果將電感器連接到一個電阻器，

If the inductor is then connected to a resistor,

跨接電阻兩端的電壓將是

the voltage across the resistor will be

電流乘以電阻器的電阻值。

the current multiplied by the resistor's resistance.

電感器為了防止電流流過電感器

The inductor prevents the current flowing through it

的瞬間變化。

from changing instantaneously.

因此，電流瞬間流過電感器

Therefore, the current flowing through the inductor immediately after

當我們撥動開關之後確實相等於

we flip the switch will be exactly equal to what the current was

我們撥動開關之前的電流值，

before we flipped the switch,

在不考慮電阻值的情形下。

regardless of what the value of the resistor is.

如果電阻值很大很大、非常地大，

If the value of the resistor is extremely large,

那麼電流值乘以電阻值也將非常地大。

then the current multiplied by the resistance will also be extremely large.

結果電感器會產生極高的電壓，

As a result, inductors can generate extremely high voltages,

至少在極短的時間內。

at least for a brief period of time.

由於流經電感的電流不能瞬間改變，

Since the current through an inductor can not change instantaneously,

當我們試著從電路將電感器斷開時，

when we try to disconnect an inductor from a circuit,

我們總是需要為電感器的電流提供一條路徑。

we always need to provide a path for the inductor's current to flow.

如果我們沒有提供電路，電感器的電流將會找到自己的路徑，

If we do not provide a path, the inductor's current will find its own path,

例如通過空氣，透過打開開關，

such as through the air, through the open switch,

或通過其他不應導電的零組件。

or through other components that are not supposed to be conducting electricity.

這會產生很大的電壓，並對電路引起可觀的損壞。

This can create very large voltages, and cause considerable damage to the circuit.

電感器產生大量電壓的能力

The ability of an inductor to create large voltages

使它們在供應電源設計中非常有用。

makes them very useful in the design of power supplies.

但是，這種能力也意味著必須謹慎

But, this ability also means that care must be taken

為了確保我們從不嘗試關閉電感器，

to ensure that we never try to switch off an inductor,

當沒有提供電流流入的電路時。

without providing a path for its current to flow in.

有關電路的更多詳細資訊

Much more detailed information about electric circuits

可在此頻道找到其他影片

is available in the other videos on this channel,

並且請訂閱此頻道，當新影片製作好之後將會通知您。

and please subscribe for notifications when new videos are ready.