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In physics, the magnetomotive force is a quantity appearing in the equation for the magnetic flux in a magnetic circuit, sometimes known as Hopkinson's law: : where ''Φ'' is the magnetic flux and ''R'' is the reluctance of the circuit. It can be seen that the magnetomotive force plays a role in this equation analogous to the voltage ''V'' in Ohm's law: ''V'' = ''IR''. Magnetomotive force is analogous to electromotive force, emf (= difference in electric potential, or voltage, between the terminals of a source of electricity, e.g., a battery from which no current is being drawn) since it is the cause of magnetic flux in a magnetic circuit:〔Smith, R.J. (1966), ''Circuits, Devices and Systems'', pp 495-506, Wiley International Edition, New York.〕 # ''ℱ'' = ''NI'' #: where ''N'' is the number of turns in the coil and #::: ''I'' is the electric current through the circuit # ''ℱ'' = ''ΦR'' #: where ''Φ'' is the magnetic flux and #::: ''R'' is the reluctance # ''ℱ'' = ''HL'' #: where ''H'' is the magnetizing force (the strength of the magnetizing field) and #::: ''L'' is the mean length of a solenoid or the circumference of a toroid ==Notes== 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「magnetomotive force」の詳細全文を読む スポンサード リンク
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