In our home, the EMF from Wi-Fi is everywhere.

在我们家中，Wi-Fi的电磁场无处不在。

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，你会在一个线圈中感应电动势——就像法拉第在他的验中所做的那样——所以解磁场的变化如何在线圈中感应电动势是有帮助的。

Well, if you're using an EMF meter and you've got it near somebody's head and they have an experience but you don't have a measurement of EMF, then potentially they're having a real experience.

嗯，如果你在使用电磁场(EMF)探测器， 并将其靠近人的头部， 而他们一些现象， 但你并未检测到电磁场的变化，那么可能他们真的情况。

And I think that's really one of the things that the new plastics economy from EMF allowed us to do.

我认为，艾伦·麦克阿瑟基金会发起的新塑料济计划赋予我们现这一目标的能力。

I got to ask you, this is a different category, but I got to get this in EMF and RF.

我得问你一下，这个属于不同的类别，但我要把这个内容放到电磁场和射频中。

Then you mentioned there around like the EMF exposure from the phone literally just being next to the testes.

你提到手机产生的电磁场辐射，如果手机紧贴着睾丸，可能会对其造成影响。

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

没有电动势反应 这点很定。

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

没有 EMF不能用 - 怎么会？

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电动势的强度。

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

当这个磁场发生变化时？这就是诱导电动势的原因。

But a simple way of improving the use of an EMF meter is moving it from waist level up to head level.

提升电磁场（EMF）测量仪使用效果的一个简易方法，就是将其从腰部高度提升至头部高度。

But I would also go so far as to say that EMFs are kind of like the smoking of our generation.

但我也敢说，电磁场（EMFs）就像是当代的吸烟问题。

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。

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，当您测量电池端子之间的际电压时， 您会得到一个低于我们理想的电动势的值。

So take care of your light environments, sunrise, sunset, block blue light after sunset, and be very careful with your EMFs.

所以要注意你的光照环境，日出、日落， 日落后要屏蔽蓝光，并且要非常小心电磁场。

It says that a changing magnetic field will induce an emf in a loop of wire.

它说不断变化的磁场会 在线圈中感应出电动势。

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

用数学术语来说，我们会说电动势等于通量变化的负数，随着时间的变化。

And we can actually see this in speckle contrast photography of the skin of how EMFs actually impact blood flow to the skin, which is the largest organ.

我们际上可以通过斑点对比摄影看到电磁场是如何影响皮肤血液流动的，而皮肤是人体最大的器官。

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

而电动势，你们可能还记得，它是电磁力的一表现，正是它使得电子移动并形成电流。

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，您解磁通量，以及磁通量的变化如何在线圈或线圈中产生电动势。