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In electrical engineering, electrical terms are associated into pairs called duals. A dual of a relationship is formed by interchanging voltage and current in an expression. The dual expression thus produced is of the same form, and the reason that the dual is always a valid statement can be traced to the duality of electricity and magnetism. Here is a partial list of electrical dualities: * voltage – current * parallel – serial (circuits) * resistance – conductance * impedance – admittance * capacitance – inductance * reactance – susceptance * short circuit – open circuit * Kirchhoff's current law – Kirchhoff's voltage law. * Thévenin's theorem – Norton's theorem == History == The use of duality in circuit theory is due to Alexander Russell who published his ideas in 1904.〔Belevitch, V, "Summary of the history of circuit theory", ''Proceedings of the IRE'', vol 50, Iss 5, pp.848-855, May 1962 .〕〔Alexander Russell, ''A Treatise on the Theory of Alternating Currents'', volume 1, chapter XXI, Cambridge: University Press 1904 .〕 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「Duality (electrical circuits)」の詳細全文を読む スポンサード リンク
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