The meters commonly used measure the amperes, volts, and time automatically, and register the electric power supplied in watt hours. 伯莎M.克拉克.科学通论.
The early arc lamps were rated to require 9 to 10 amperes of current, at 45 volts pressure each, receiving which they were estimated to give 2000 c. 弗兰克·刘易斯·戴尔.爱迪生的生平和发明.
An iron bar was also used, polished, and with a man standing on it to insure solid contact; but only one thousand amperes passed through it--i. 弗兰克·刘易斯·戴尔.爱迪生的生平和发明.
Knowing the time during which the current has run, and the amount of deposit, the strength of the current in amperes can be calculated. 伯莎M.克拉克.科学通论.
It was several months before he could convey one hundred amperes by means of such contacts, but he worked out at last a satisfactory device which was equal to the task. 弗兰克·刘易斯·戴尔.爱迪生的生平和发明.
Thus a current of from one to two volts, and one to several thousand amperes, is best suited. Edward W. Byrn.十九世纪发明进展.
For the locomotive a four-wheel iron truck was used, and upon it was mounted one of the long Z type 110-volt Edison dynamos, with a capacity of 75 amperes, which was to be used as a motor. 弗兰克·刘易斯·戴尔.爱迪生的生平和发明.
The next point was to secure a joint between contiguous rails such as would permit of the passage of several thousand amperes without introducing undue resistance. 弗兰克·刘易斯·戴尔.爱迪生的生平和发明.
The watt then would be the volt multiplied by the ampere; thus 500 watts would be 10 amperes at 50 volts, or 50 amperes at 10 volts. Edward W. Byrn.十九世纪发明进展.