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

在我们家中，Wi-Fi电磁场无处不在。

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

没有 EMF不能用 - 怎么会？

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

我用EMF把特莱斯卡房子扫视过一遍 没什么发现。

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

没有电动势反应 这点很确定。

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

当这个磁场发生变化时？这就是诱导电动势原因。

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

而电动势，们可能还记得，它是电磁力一种表现，正是它使得电子移动并形成电。

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

到手机产生电磁场辐射，手机紧贴着睾丸，可能会对其造成影响。

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新塑料经济计划确实赋予了我们实现这一目标能力。

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

我得问一下，这个属于不同类别，但我要把这个内容放到电磁场和射频中。

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，说理想电压 由电池供是它电动势。

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）就像是当代吸烟问题。

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

升电磁场（EMF）测量仪使用效一个简易方法，就是将其从腰部高度升至头部高度。

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。

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

用数学语言来说，我们可以说电动势等于磁通量变化负值除以时间变化。

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实际电压时，您会得到低于我们理想电动势电位读数。

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

因此，通过第二个线圈磁通量会 发生变化，从而产生电动势。

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

我们很快就会看到，电动势取决于线圈和磁场之间夹角正弦值。

And you calculate the terminal voltage by subtracting the voltage drop due to internal resistance from the supplied emf voltage, designated by a script E.

然后通过从传递电动势电压中减去由于内部电阻引起电压降来计算端电压，用字母 E 表示。

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.

经充电板交电源会在手机线圈中感应出电动势，从而可以使用该能量为电池充电。

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

这意味着通过线圈中环路磁通量会随着时间而变化，这就是感应电动势原因。