ECE 201 Circuit Theory I1 Physical Characteristics of Inductors.
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ECE 201 Circuit Theory I1 Physical Characteristics of Inductors
ECE 201 Circuit Theory I2 L = Inductance in Henrys (H) N = the number of turns μ = permeability in Henrys/meter (H/m) A = cross-sectional area in meters (m)
ECE 201 Circuit Theory I3 Winding Resistance, R W The resistance of the wire used to make the coil (winding). Most of the time assumed negligible.
ECE 201 Circuit Theory I4 Winding Capacitance, C W Stray capacitance due to two conductors placed side – by – side.
ECE 201 Circuit Theory I5 Faraday’s Law Moving a magnet through a coil of wire induces a voltage across the coil. When a complete path is provided, the induced voltage causes an induced current. The amount of induced voltage in a coil is directly proportional to the rate of change of the magnetic field with respect to the coil.
ECE 201 Circuit Theory I6 Inducing a Voltage by Moving a Magnet
ECE 201 Circuit Theory I7 The induced voltage is proportional to the number of turns, N, of the wire and the rate of change of the magnetic flux.