The control wire connects to a coil of wire inside the relay.

控制线连着继电器里的线圈。

We're talking about coils of wire with plastic-coats to keep them warm!

我们是在说线圈，它们有塑料外皮可以保暖！

The shaft from a turbine spins a magnet inside a tightly wound coil of wire.

涡轮的轴在绕得很紧的线圈里旋转磁铁。

And the same idea applies to a coil of wire rotating in a magnetic field, too.

同样的想法也适用于 在磁场中旋转的线圈。

The turning of the blades spins coils of wire inside a magnetic field, producing a steady supply of electricity.

叶片的转动使磁场内的线圈旋转，从而产生稳定的电力供应。

See, that coil of wire is a special shape called a solenoid.

你看，那一圈电线是一个特殊的形状 它被称为螺线管。

Metal detectors work by generating a current in a coil of wire in short pulses, each of which briefly creates a magnetic field within the detector.

金属探测器是通过线圈产生脉冲电流工作的，每一个脉冲电流会在探测器中形成一个磁场，当某一金属物体通过探测器时，这个磁场会在金属中产生另一个电流。

For example, with coils of wire, we know that when the current is changing, a magnetic flux is induced in the coil.

例如，对于线圈，我们知道当电流变化时，线圈中会感应出磁通量。

And finally, instead of finding the emf in just one loop of wire, we're finding the emf in a whole coil of wire.

最后，我们不是在一个线圈中找到电动势，而是在一整圈电线中找到电动势。

Today, you learned about magnetic flux, and how a change in magnetic flux can induce an emf in a loop or coil of wire.

今天，您了解了磁通量，以及磁通量的变化如何在线圈或线圈中产生电动势。

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，您的计算机将磁盘的某些部分旋转经过磁头，磁头是一个带有线圈的小型电磁体。

He was surprised and interested to find out that the man was not using batteries, but a small generator made of a magnet and coils of wire.

当他发现这个人使用的不是电池，而是一个由磁铁和线圈制成的小型发电机时， 他既惊讶又感兴趣。

That's because another important device that gets electricity from the power plant to your house is a transformer, which is made up of two coils of wire.

这是因为从发电厂向您家供电的另一个重要设备是变压器，它由两个线圈组成。

Motors take electrical energy – so, the current running through a coil of wire – and convert it into mechanical energy as the motor turns.

电机吸收电能——即流过线圈的电流——并在电机转动时将其转换为机械能。

It's also  interesting to note that the physics of magnetic fields deflecting moving electrons, called the  Lorentz Force, is the driving principle behind all electric motors, just with coils of wires  and different configurations of magnetic fields.

同样有趣的是， 磁场偏转移动电子的物理原理，称为洛伦兹力， 是所有电动机背后的驱动原理，只需线圈和不同配置的磁场即可。

But often, you’ll be inducing emf in a coil of wire – like what Faraday was doing in his experiment – so it helps to know how a change in the magnetic flux will induce emf in a coil.

但通常情况下，你会在线圈中感应出电动势——就像法拉第在他的实验中所做的那样——所以了解磁通量的变化如何在线圈中感应出电动势是有帮助的。

Generators, on the other hand, take mechanical energy – the rotation of a coil of wire – and use induction to convert it into electrical energy, in the form of a current running through a wire.

另一方面，发电机获取机械能——线圈的旋转——并使用感应将其转换为电能，以电流流过电线的形式。

Which means that the induced emf in a coil of wire is equal to the number of coils, times the change in magnetic flux over the change in time, all multiplied by a negative sign.

这意味着线圈中的感应电动势为 等于线圈数乘以磁通量随时间变化的变化，全部乘以负号。

He set up a current flowing through a coil of wire so that it would generate a magnetic field, and then he watched to see if that magnetic field induced a current in a second coil of wire.

他设置了一个流过线圈的电流，使其产生磁场，然后他观察该磁场是否在第二个线圈中感应出电流。

But often, you'll be inducing emf in a coil of wire – like what Faraday was doing in his experiment – so it helps to know how a change in the magnetic flux will induce emf in a coil.

但通常，你会在线圈中感应电动势——就像法拉第在他的实验中所做的那样——因此了解磁通量的变化将如何在线圈中感应电动势会有所帮助。