A device that precisely measures the quantity of electricity using Faraday's law of electrolysis. There are silver coulometers and copper coulometers. The former is particularly accurate and was previously used to determine the international unit of electric current. When a current I is passed through an electrolyte for time t , silver (copper) precipitates at the cathode, increasing its mass by M , and the same amount of silver (copper) dissolves at the anode, decreasing its mass by M. The quantity of electricity that passes, Q , is expressed as Q = It = M / Z , where Z is the electrochemical equivalent of this substance. Source: Encyclopaedia Britannica Concise Encyclopedia About Encyclopaedia Britannica Concise Encyclopedia Information |
ファラデーの電気分解の法則を利用して電気量を精密に測定する装置。銀電量計,銅電量計などがある。前者は精度が特に高く,以前は電流の国際単位を決めるのに用いられた。電解液に電流 I を時間 t 流したとき,陰極には銀 (銅) が析出して質量が M 増加し,陽極では同量の銀 (銅) が溶解して質量が M 減少する。通過電気量 Q は Q=It=M/Z で表わされる。 Z はこの物質の電気化学当量である。
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