LED's require resistors to control current when used with batteries rated at over 2 volts.
当使用2伏以上的电池时，需要使用额外的电阻来帮助控制电流。
The team has a device that integrates hundreds of nanowires into an array, giving an output current of about 100 nano-amps at 1.2 volts.
该小组利用一个装置，将数百根纳米线集合排列，每1.2伏特可产生约100纳米安培的输出电流。
Five nanogenerators working together produced about 1 micro ampere output current at 3 volts about the same voltage generated by two regular AA batteries.
5个纳米发电机同时工作可以产生1微安培3伏特的输出电流，与2节普通的5号电池所产生的电压差不多。
It can send a jolt of as much as eight hundred volts of electricity through the water in which it lives. (an electric house current is only one hundred twenty volts.)
在它生活的水中，电鳗可以释放一阵电压高达800伏的电流(家庭用电电压也仅有120伏)。
Electrical Circuitry: Converters stabilize the current's varying frequencies. Transformers boost voltage from 690 volts to more than 22,000, so current travels efficiently over long-distance lines.
电气线路：利用整流装置稳定电流的变化频率，此外通过变压器把690伏特的电压提升到超过2200 0伏特，大大提高了电流长途输送的效率。
Electrical Circuitry: Converters stabilize the current's varying frequencies. Transformers boost voltage from 690 volts to more than 22, 000, so current travels efficiently over long-distance lines.
电气线路：利用整流装置稳定电流的变化频率，此外通过变压器把690伏特的电压提升到超过2200 0伏特，大大提高了电流长途输送的效率。
The resistance of any length of a conducting wire is easily measured by finding the potential difference in volts between its ends when a known current is following.
已知导线中流过的电流，只要测出导线两端电位差的伏特值，就能很容易得出任何长度导线的电阻值。
Such a motor can produce a transient overvoltage, reaching many thousands of volts, when the normal rms current is interrupted.
当通常的均方根电流被打断，这样的一个电机可以产生一个可达几千伏的电涌过压。
To minimize the effects of dielectric absorption on current measurements, avoid applying voltages greater than a few volts to insulators being used for sensitive current measurements.
为使电流测量时的电介质吸收影响减到最小，用来做对极小的电流测量的绝缘体，应避免施加大于数伏的电压。
The circuit shown above provides about 11 mA with 385 volts across the constant current element (6sn7).
图中所示电路，当恒流管(6sn7)上加载385v时可以提供11mA的恒定电流。
The resistance of any length of a conducting wire is easily measured by finding the potential difference in volts between its ends when a known current is following.
已知导线中流过的电流，只要测出导线两端电位差的福特值，就能很容易得出任何长度导线的电阻值。
Thee resistance of any length of a conducting wire is easily measured by finding the potential difference in volts between its ends when a known current is following.
已知导线中流过的电流，只要测出导线两端电位差的福特值，就能很容易得出任何长度导线的电阻值。
An electrical power transformer that converts 220-250 volts AC current to high voltage DC.
一个把220 ~ 250伏交流电转化成高压直流电的变压器。
An electrical power transformer that converts 220-250 volts AC current to high voltage DC.
一个把220 ~ 250伏交流电转化成高压直流电的变压器。
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