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These are nonionizing EMF of much longer wavelength.

是非电离射,波

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Crash Course 综

And when that field changes? That’s what induces an emf.

那个领域什么时候改变?诱发动势的原因。

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Supernatural S01

Yeah, but the EMF's no good. - Why?

没有 EMF不能用 - 怎么会?

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Supernatural S02

Well, no traces of EMF, that's for sure.

没有动势反应 点很确定。

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Supernatural S01

I just swept the Telesca house with the EMF. It's clean.

我用EMF把特莱斯卡的房子扫视过一遍 没什么发现。

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Crash Course Physics 速成课物理

So an emf is induced in the second coil.

因此在第二个线圈中感应出一个动势。

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Crash Course 综

And emf, you’ll recall, stands for electromotive force, which is what causes electrons to move and form a current.

动势,你会记得,代表动势,导致子移动并形成流的原因。

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Crash Course Physics 速成课物理

So the magnetic flux through the second coil changes, which induces an emf.

因此,通过第二个线圈的磁通量会 发生变化,从而产生动势。

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Crash Course Physics 速成课物理

This means that the magnetic flux through the loops in the coil changes over time, which is what induces an emf.

意味着通过线圈中的环路的磁通量会随着时间而变化,感应动势的原因。

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Crash Course Physics 速成课物理

And as we'll soon see, the emf depends on the sine of the angle between the coil and the magnetic field.

我们很快会看到,动势取决于线圈和磁场之间夹角的正弦值。

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Crash Course Physics 速成课物理

So we shorten this to say that the ideal voltage supplied by the battery is its emf.

所以我们缩小范围,说理想压 由池提供的它的动势。

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Crash Course 综

In maths terms, we’d say that the emf is equal to the negative of the change in flux, over the change in time.

在数学术语中,我们会说动势等于通量变化随时间变化的负数。

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Crash Course Physics 速成课物理

And it's negative, because the induced emf is in the opposite direction of the main current.

负的,因为感应动势 与主流方向相反。

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Crash Course 综

These days, we call this idea Faraday’s Law of Induction: It says that a changing magnetic field will induce an emf in a loop of wire.

如今,我们将个想法称为法拉第感应定律:它说变化的磁场会在线圈中感应出动势。

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Crash Course Physics 速成课物理

This induction of an emf that opposes the main current is called self-inductance.

种与主流相反的动势的感应 称为自感。

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Crash Course Physics 速成课物理

So, when you measure the actual voltage between the terminals of the battery, you get a value that's less than our ideal emf potential.

因此,当您测量池端子之间的实际压时,您会得到低于我们理想动势位的读数。

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Crash Course 综

So, when you measure the actual voltage between the terminals of the battery, you get a value that’s less than our ideal emf potential.

因此,当您测量池端子之间的实际压时, 您会得到一个低于我们理想的动势的值。

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Crash Course Physics 速成课物理

Now, we can calculate the strength of the emf in a generator using some of the principles we talked about last time.

现在,我们可以使用我们上次讨论的一些原理来计算生成器中动势的强度。

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Crash Course Physics 速成课物理

And this relationship works the opposite way as well, with a changing magnetic flux inducing an emf that opposes the flux.

种关系也以相反的方式起作用,变化的磁通量会产生与磁通量相反的动势。

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Crash Course Physics 速成课物理

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,我们不在一个线圈中找到动势,而在一整圈线中找到动势。

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Crash Course Physics 速成课物理

And when that field changes? That's what induces an emf.

当该领域发生变化时? 产生动势的原因。

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