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翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Barlow's law ： ウィキペディア英語版 Barlow's law Barlow's law was an incorrect physical law proposed by Peter Barlow in 1825 to describe the ability of wires to conduct electricity.〔〔 It said that the strength of the effect of electricity passing through a wire varies inversely with the square root of its length and directly with the square root of its cross-sectional area, or, in modern terminology: ::$I\; \backslash propto\; \backslash sqrt\backslash frac$ where ''I'' is electric current, ''A'' is the cross-sectional area of the wire, and ''L'' is the length of the wire. Barlow formulated his law in terms of the diameter ''d'' of a cylindrical wire. Since ''A'' is proportional to the square of ''d'' the law becomes $I\; \backslash propto\; \backslash frac\backslash cdot\; V$. Ohm's law is now considered the correct law and Barlow's false. The law Barlow proposed was not in error due to poor measurement; in fact it fits Barlow's careful measurements quite well. Heinrich Lenz pointed out that Ohm took into account "all the conducting resistances...of the ciruit" whereas Barlow did not.〔 In particular, Ohm explicitly includes a term for what we would now call internal resistance of the battery. Barlow does not have this term and approximates the results with a power law instead. Ohm's law in modern usage is rarely stated with this explicit term but nevertheless an awareness of it is necessary for a full understanding of the current in a circuit.〔 == References == 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Barlow's law」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.