Some cutting-edge photovoltaic cells offer an even higher initial efficiency but fall behind when the DC power they produce is converted to grid-ready alternating current.
一些先进的光伏电池甚至可以提供更高的效率，但是由于要把直流电源转化为交流电，转换效率有所降低。
The disadvantage is that reverse electrodialysis produces direct current, whereas the world runs mostly on alternating current.
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。
Mains electricity in America is supplied as alternating current at 60 Hertz.
在美国，主要供应频率为60赫兹的交流电。
The system generates a direct current, so using it to power DC devices locally is more efficient than switching to the alternating current needed to feed it back to the grid.
该系统产生的电流为直流电，所以用来驱动本地的直流点装置比将其转化为交流电输入电网来的更有效率。
Or electricity. In the early 1900s, after the standardization to alternating current distribution, hundreds of small electric utilities were consolidated into huge holding companies.
再举一个电力方面的例子，早在1900年，交流电标准发布以来，成千上万的小型电力公司合并成了大型的控股公司。
Diodes are electronic devices which rectify alternating current to direct current.
二极管是将交流电整流成直流电的电子装置。
This vibration creates an alternating current that can be tapped.
电子振动又产生了可以利用的交变电流。
PLUG in your toaster—or your television or your vacuum cleaner—and the electricity that surges through it is an alternating current.
当你为你的吐司炉——或者电视、吸尘器——插好插头、打开电源时，电能便以交流电的形式为这些家用电器供电。
In some parts of the world, cyclists have been powering safety lights for years with devices called bicycle dynamos, which use a generator to create alternating current with every turn of the wheels.
在世界的一些地方，骑自行车的人已经通过叫自行车发电机的装置产生了多年的安全电能。当自行车车轮转动的时候一个装在上面的发电机就会产生交流电。
On top of that, the field generated by an alternating current interacts with the ground more strongly than it does with the air.
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。
Alternating current is different from direct current in that it constantly changes its direct of flow.
交流电与直流电的不同之处在于交流电不断地改变其电流流动方向。
Step down transformers provide low voltage AC power for lighting, instruments and other circuits that use alternating current at a lower voltage.
降压变压器低压AC电源提供照明，仪器仪表和其他使用交流电在一个较低的电压的电路。
I2C bus digital potentiometer AD5242 was used as core of digital alternating current parameter multi-function meter, it has a point, two point and multiple point sampling arithmetic.
数字式工频交流电参数多用表以i2c总线数字式电位器ad5242为核心，其采样算法有一点、两点及多点。
On the railway of electrization, power supply mode is requested to be the single-phase alternating current.
在铁道电气化牵引区段，牵引供电网采用单相工频交流电供电方式。
Alternating current is the current whose direction changes periodically.
交流电是其方向周期地变化的电流。
This is an alternating current generator.
这是一台交流发电机。
The interface dynamic behaviors of sulfide mineral carbon paste electrodes in NaCl electrolyte were investigated by alternating current impedance technique.
采用交流阻抗法研究硫化矿碳糊电极体系在氯化钠电解液中的界面动力学行为。
The product of the effective values of the voltage and current with the cosine of the phase Angle between current and voltage in an alternating-current circuit.
伏特量交流电路中电压与电流的有效值以及电流与电压之间相位角的余弦之乘积。
For reasons the alternating current is more widely used than the direct current.
由于种种原因，交流电比直流电用得更为广泛。
Analyse principle of operation, technology feature of single-phase alternating current induced liquid metal electromagnetic pump wave soldering machine.
重点分析单相交流感应式液态金属电磁泵波峰焊接设备技术的工作原理、技术特征；
The most crucial point to the dynamic analysis is the drawing of alternating current load line .
动态分析的对象是交流通路，图解法动态分析的关键是作交流负载线。
Primary electrical power is provided by two engine driven generators which supply three-phase, 115 volt 400 cycle alternating current.
主电力是由两个发动机驱动发电机供应三相，115伏400周期交流电。
BUS protection PANEL, a module (black box) containing electrical circuits for control and protection of electrical alternating current supply to the airplane.
汇流条防护板，黑匣子式的组件，内含控制和保护飞机交流电源的电路。
BUS protection PANEL, a module (black box) containing electrical circuits for control and protection of electrical alternating current supply to the airplane.
汇流条防护板，黑匣子式的组件，内含控制和保护飞机交流电源的电路。
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