At the other end, the current energizes an electromagnet and this attracts the armature.

在另一端，电流使电充电，并吸到电枢。

The Large Hadron Collider at Cern is a 27km loop of powerful electromagnets.

欧洲核子研究组织大型强子对撞机是一个长达27公里强大电线圈。

For you though, you're going to use the electromagnet without the crane.

不过，对于您来说， 您在没有起重机情况下使用电。

This makes electromagnets quite different from permanent magnets.

这使得电体与永体有很大不同。

These electromagnets will help keep the superhot plasma in the center of a tube.

这些电有助于超热等子体保持在管子。

So let's take a look at that and compare permanent magnets to electromagnets.

让我们看一下并永体与电体进行比较。

But Dr Laberge believes that doing without electromagnets has simplified the design and removed potential points of failure.

但 Laberge 博士认为，不使用电可以简化设计并消除潜在故障点。

Electromagnets are typically made of loops of wire and a coil.

电体通常由线圈和线圈制成。

And finally, electromagnets need a power source in order to generate the electricity required to produce magnetic fields.

最后，电体需要电源才能产生产生场所需电力。

One type of temporary magnet is called an electromagnet.

一种类型临时称为电体。

This, though, required both high pressure, which is expensive to create, and the electromagnets themselves, which are costly to buy and costly to run.

不过这需要两种高压，成本很高，电本身购买和运行成本就很高。

Let's take a moment to look at the definition of what an electromagnet is.

让我们花点时间看一下电体定义。

Electromagnets are materials that become magnets in the presence of electricity.

电体是在有电情况下变成材料。

We use electromagnets in all sorts of other applications, from motors to speakers and even medical scanners.

我们在各种其他应用使用电体，从电机到扬声器，甚至医疗扫描仪。

To read that information, your computer rotates sections of the disk past the head, which is a small electromagnet that has a coil of wire.

要读取该信息，您计算机盘某些部分旋转经过头，头是一个带有线圈小型电体。

Permanent magnets have a fixed strength, but we just talked about how we can change the strength of electromagnets, so electromagnets have adjustable strength.

永体强度是固定，但是我们刚才讲了如何改变电强度，所以电强度是可调。

The other thing we can control with electromagnets is the direction of the magnetic field, and we can do this by changing the direction of the electricity.

我们可以用电体控制另一件事是场方向，我们可以通过改变电流方向来实现这一点。

It's shaped like a doughnut, and it uses powerful electromagnets to suspend the super hot hydrogen plasma in a vacuum, keeping it stable and away from the walls of the machine.

它形状像一个甜甜圈， 它使用强大电超热氢等子体悬浮在真空，使其保持稳定并远机器壁。

A turbine spins a magnet inside a coil to produce electricity, and since electromagnets need a power source, this turbine is powered by wind.

涡轮机旋转线圈内来发电，由于电体需要电源，因此该涡轮机由风提供动力。

Permanent magnets do not need a power source, but this means that we can also turn electromagnets on and off, which is pretty cool when you think about it.

永体不需要电源，但这意味着我们也可以打开和关闭电体，想想看，这真是太酷了。