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

在另一端，流使充，并吸到枢。

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

欧洲核子研究组织的大型强子对撞是一个长达27公里的强大线圈。

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

不过，对于您来说， 您将在没有的情况下使用。

This makes electromagnets quite different from permanent magnets.

这使得体与永体有很大不同。

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

这些将有助于将超热等子体保持在管子的中心。

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

让我们看一下并将永体与体进行比较。

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

但 Laberge 博士认为，不使用可以简化设计并消除潜在的故障点。

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

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，体需要源才能产生产生场所需的力。

One type of temporary magnet is called an electromagnet.

一种类型的临时称为体。

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，本身的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体的定义。

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

体是在有的情况下变成的材料。

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中使用体，从到扬声器，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，您的计算将盘的某些部分旋转经过头，头是一个带有线圈的小型体。

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

永体的强度是固定的，但是我们刚才讲了如何改变的强度，所以的强度是可调的。

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.

我们可以用体控制的另一件事是场的方向，我们可以通过改变流的方向来实现这一点。

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.

它的形状像一个甜甜圈， 它使用强大的将超热氢等子体悬浮在真空中，使其保持稳定并远器壁。

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

涡轮旋转线圈内的来发，由于体需要源，因此该涡轮由风提供动力。

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.

永体不需要源，但这意味着我们也可以打开和关闭体，想想看，这真是太酷了。