esu - Yes, you

Japanese: esu - いーえすゆー
esu - Yes, you

...A type of unit system. It is represented by the symbol ESU. When two point charges with electric charge q are separated by a distance r , the force f acting on them is expressed as f = kq 2 / r 2 , where k is the proportionality constant. If we now assume that k is dimensionless and its value is equal to 1, then q = f 1/2r , so we can define the unit of electric charge q as (unit of force) 1/2 ・ (unit of length), and based on that, we can also determine the units of electric current and other quantities. ...

*Some of the terminology explanations that mention "esu" are listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

Japanese:

…単位系の一種。記号esuで表す。電気量qをもつ二つの点電荷が,互いに距離rだけ隔たって存在するとき,両者に作用する力fは,比例定数をkとして,fkq2/r2で表されるが,いまkは無次元でその値は1に等しいと取り決めれば,qf1/2rとなるから,電気量qの単位を(力の単位)1/2・(長さの単位)と定義することができ,それをもとにして電流その他の量の単位をも定めることができる。…

※「esu」について言及している用語解説の一部を掲載しています。

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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