有些型号的电池在接入直流电源时就能充电。
Some kinds of batteries can be recharged by connecting them to a source of direct current.
交流电总给人一种不稳定的感觉。
好消息是直流电网的建造成本更低。
网上有很多地方都卖直流电动机。
不经光子转交流电源系统效率更高。
No system is more efficient at converting photons to grid-ready AC power.
二极管是将交流电整流成直流电的电子装置。
Diodes are electronic devices which rectify alternating current to direct current.
这真像是一部二流电视剧。
交/直流电压，电压几百伏到数万伏可调。
It is performed in AC or DC with voltages varying from some hundred volts to several tens of kilovolts.
在美国，主要供应频率为60赫兹的交流电。
Mains electricity in America is supplied as alternating current at 60 Hertz.
同样的情况也适用于许多其他主流电脑设备。
开关接通，1,000伏特的交流电猛击凯姆勒。
The switch was thrown, and 1,000 volts of AC slammed into Kemmler.
这导致他的故事被主流电视媒体的新闻节目所播放。
That led to his story being picked up by major television news outlets.
而中央直流电源直接为服务器供能将大幅提高效率。
It would be far more efficient to power servers directly from a central DC supply.
无线广播电视与认购的电缆电视和网络数据流电视不同。
Broadcast television is not the same as subscription cable channels or streaming Internet video.
“感抗”这个术语只适用于交流电路，其测量单位为欧姆。
The term IMPEDANCE is applicable only to AC circuits. Its unit of measurement is the ohm.
你们都知道，我们用的是交流电，有时工作，有时不工作。
As you can see, we have alternating currents. Sometimes it works and sometimes it doesn't.
它出现在了像《今日秀》和《视野》这样的主流电视节目中。
It's been on major TV shows like 'The Today show' and 'The View.'
不足处是反向电渗析产生的是直流电，而世界上主要使用交流电。
The disadvantage is that reverse electrodialysis produces direct current, whereas the world runs mostly on alternating current.
控制电压和由恒流电源输出的电流之间的关系改变可能会产生漂移。
The relationship between the control voltage and the current output by the constant-current source may shift.
发动机采用高压直流电驱动，电流转换通过直流-直流转换器实现。
The motor is powered by high voltage DC supply and the current from the fuel cell system is regulated via a DC DC converter.
Barbra是第一位在好莱坞主流电影Yentl中自编、自导、自演的女性。
She was the first woman to write, produce, direct, and star in a mainstream Hollywood film: Yentl.
公司生产电力逆变器，把太阳能生成的直流电源转换为使用最多最需要的交流电源。
The company manufactures power inverters necessary to convert the DC power generated by solar panels into the ac power required for most USES.
这真像是一部二流电视剧。所有的人都在哭。我从未想过这种事情会发生在我身上。
It was really like a second-rate TV drama. The whole family was crying. I had never imagined that it would ever happen to me.
被选中的项目包括先进的电池系统（包括液流电池），飞轮电池，压缩空气能源系统。
The selected projects include advanced battery systems (including flow batteries), flywheels, and compressed air energy systems.
高空架线的话，由交流电产生的电磁场与地面的感应要比空中的电场交互作用强大得多。
On top of that, the field generated by an alternating current interacts with the ground more strongly than it does with the air.
这个白色的像个砖块似的玩意比一般的交流电压适配器稍大点，任何地方都可以放得下。
The device is a small white brick-just a little bigger than a regular AC adapter-that can fit just about anywhere.
或许现在最大的问题是：现在的主流电视网络（NBC，CNN等）如何适应这股潮流？
Perhaps the big question is: how will the current mainstream TV networks (NBC, CNN, etc) adapt?
空间光电池阵列所收集到的电力将在转换成微波后发射到地球，再在地面上转换成直流电。
The energy captured by space-basedphotovoltaic arrays would be converted into microwaves for transmissionto Earth, where it would be transformed into direct-current electricity.
问题是直流电源并无单一标准，因此拥有不同卖家设备的数据中心很难做到这样的能源节约。
The problem is that there is no single standard for DC power supplies, so such savings cannot easily be achieved in a data centre filled with equipment from different vendors.
问题是直流电源并无单一标准，因此拥有不同卖家设备的数据中心很难做到这样的能源节约。
The problem is that there is no single standard for DC power supplies, so such savings cannot easily be achieved in a data centre filled with equipment from different vendors.
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