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

没有动势反应 点很确定。

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。

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

那领域什么时候改变？诱动势的原因。

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

因此，通过第二线圈的磁通量会 生变化，从而产生动势。

So an emf is induced in the second coil.

因此在第二线圈中感应出动势。

The magnetic flux through the loop changes, which induces an emf.

通过环路的磁通量生变化， 从而产生动势。

And that flux seeks to oppose the current with an electromotive force, or emf, in the opposite direction.

并且该通量试图以相反方向的动势或动势对抗流。

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。

The strength of the emf is equal to negative of the change in the magnetic flux, over the change in time.

随着时间的变化，动势的强度等于磁通量变化的负值。

First, in the early 1800s, Michael Faraday showed us how a changing magnetic field induces an electromotive force, or emf, resulting in an electric current.

首先，在 19 世纪初，迈克尔·法拉第向我们展示了变化的磁场如何产生动势或动势，从而产生流。

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。

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。

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

它负的，因为感应动势 与主流方向相反。

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。

The AC power running through the charging pad induces an emf in your phone's coil, which can use the energy to charge its battery.

流经充板的交流源会在手机线圈中感应出动势，从而可以使用该能量为池充。

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的动势的值。

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。

And if the flux increases over time, the emf decreases.

如果通量随时间增加，则动势会 降低。

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。

But when it comes to inducing emf, what really matters is how the flux is changing over time.

但当涉及到感应动势时，真正 重要的通量如何随时间变化。