Ampere balance

Japanese: 電流秤 - でんりゅうばかり(英語表記)ampere balance
Ampere balance
A device used for absolute measurement of electric current, which realizes the unit of current ampere according to the definition. Methods for doing so include the current balance, which determines the force between two coils carrying a constant current by comparing it with a mass standard, and the electrodynamometer, which uses the rotational force between coils. The diagram shows the principle of the current balance. F C , F' C are fixed coils, and M C is a moving coil, suspended from one arm of the balance. The force between one fixed coil and one moving coil is expressed as follows: f , I , M , and x are the force, current, mutual inductance, and vertical displacement, respectively.

Source: Heibonsha World Encyclopedia, 2nd Edition Information

Japanese:
電流単位アンペアを定義に従って実現する電流の絶対測定に用いられる装置。その方法には一定電流の流れる二つのコイル間の力を質量標準と比較して求める電流ばかりと,コイル間の回転力を用いるエレクトロダイナモメーターがある。図に電流ばかりの原理を示す。FC,F′Cは固定コイル,MCは可動コイルでてんびんの一つの腕からつり下げられている。一つの固定コイルと可動コイル間の力は,で表される。f,I,M,xはそれぞれ,力,電流,相互インダクタンス,上下方向の変位である。

出典 株式会社平凡社世界大百科事典 第2版について 情報

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