For most things that run on DC, that's from the battery to whatever it's powering.

对于大多数使用直流电源的东西，所有能源都来自电池。

Which inventor is famous for his contributions to the alternating current electrical system?

哪个因对交流电系统的贡献而出？

It's just, it's just a direct current, is exactly what it is.

这就是直流电，正是它的本来面目。

The electrons that move along an alternating current, on the other hand, periodically and consistently change direction.

另方面，在交流电中移动的电子会周期性地、持续地改变方向。

Now free to pursue his own ideas, Tesla begins looking for an investor to back his AC technology.

现在特斯拉可以尽情追求自己的理想了 他开始要位愿意支持交流电技术的投资人。

But Edison believes that higher voltage AC is more dangerous than the direct current electric standard he's pioneered.

但爱迪生认为 高压交流电比他倡导的直流电更加危险。

So there's a little converter in there and it's designed so it doesn't care what frequency the AC input is.

所以机器里面有个小型转换器，它是特制的，因而不用担心交流电的输入频率。

In DC, or direct current, is exactly what it sounds like, the electrons go directly where they're headed without backtracking.

DC 是直流电，和它的样，电子始终沿着同方向流动。

Edison used all sorts of dirty tricks to try to discredit AC.

爱迪生用尽了各种肮脏伎俩试图败坏交流电的声。

He begins using Tesla's alternating current in a series of demonstrations, hoping to scare the public about AC's power.

他开始使用特斯拉的交流电进行系列演示 希望吓退公众对交流电的兴趣。

Otherwise, the frequency of the AC power will speed up above 60 hertz.

否则，交流电的频率将会加快到超过60赫兹。

However, Tesla was unable to garner any serious interest in Alternating Currents.

然而，特斯拉无法获得任何人对交流电的认真关注。

The direct current part is very important for our story.

直流电部分对我们的故事非常重要。

And now the whole world sees what alternating current can do.

如今，全世界都见证了交流电的巨大潜力。

You could kill a man with half the energy, you go ac.

交流电可以用半的电力杀人。

Now, let's say you're calculating the average power consumed by an AC circuit.

现在，假设您正在计算 交流电路消耗的平均功率。

Edison was a proponent of DC (or Direct Current) and Tesla of AC (or Alternating Current).

爱迪生是 DC（或直流电）的支持者， 特斯拉是 AC（或交流电）的支持者。

Morgan and Edison may have lit up New York, but Westinghouse and Tesla believe alternating current's greater power is more effective...

摩根和爱迪生点亮了纽约 但威斯汀豪斯和特斯拉相信交流电将会具有更大的效用。

From then on, the commercial competition between direct current and alternating current reached a white-hot stage.

从此，直流电和交流电之间的商业竞争进入了白热化阶段。

Feeling the pressure from Morgan, Edison sets out on a mission to prove his direct current is the safest form of electricity.

感觉到来自摩根的压力 爱迪生启动了项计划 他要证直流电是最安全的。