Mechatronic Systems Engineering 2201A/B Lecture Notes - Lecture 20: Electromagnetic Induction, Inductor, Inductance
15 Jan 2020
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Document Summary
An inductor is usually constructed by coiling a wire around some type of form. The current flowing through the coil creates a magnetic field or magnetic flux. Frequently, the coil form is composed of a magnetic material (such as iron or iron oxides) that increases the magnetic flux. When the current changes in value, the resulting magnetic flux changes. Changing of a flux induces voltage across the coil (this is the faraday"s law of electro-magnetic induction) The polarity of the induced voltage is such as to oppose the change in current. For an ideal inductor, the voltage is proportional to the time-rate of change of the current. In passive reference configuration, the relation between the voltage and the current for. The induced voltage opposes the change in current an ideal inductor is: Units for inductance are henries ( ): 1 henry = Inductance is analogous to inertia of a heavy paddle wheel or turbine placed in the current.
