Self inductance - are simply wire coils often with...

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Self inductance Coils can also induce emf's in themselves. If a changing current is passed through a coil, a changing magnetic field will be produced, inducing an emf in the coil. Again, this emf is given by: As with mutual inductance, the induced emf is proportional to the change in current. The induced emf can be written as: The constant L is known as the inductance of the coil. It depends on the coil geometry, as well as on whether the coil has a core of ferromagnetic material. We've already discussed resistors and capacitors as circuit elements. Inductors, which
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Unformatted text preview: are simply wire coils, often with ferromagnetic cores, are another kind of circuit element. One of the main differences between these is what happens to electrical energy in them. Resistors dissipate electrical energy in the form of heat; capacitors store the energy in an electric field between the capacitor plates; and inductors store the energy in the magnetic field in the coil. The energy stored in an inductor is: In general, the energy density (energy per unit volume) in a magnetic field is:...
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