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Physical Characteristics of Inductors. L = Inductance in Henrys (H) N = the number of turns μ = permeability in Henrys/meter (H/m) A = cross-sectional area in meters (m). Winding Resistance, R W. The resistance of the wire used to make the coil (winding).
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Physical Characteristics of Inductors ECE 201 Circuit Theory I
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 I
Winding Resistance, RW • The resistance of the wire used to make the coil (winding). • Most of the time assumed negligible. ECE 201 Circuit Theory I
Winding Capacitance, CW • Stray capacitance due to two conductors placed side – by – side. ECE 201 Circuit Theory I
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 I
Inducing a Voltage by Moving a Magnet ECE 201 Circuit Theory I
The induced voltage is proportional to the number of turns, N, of the wire and the rate of change of the magnetic flux. ECE 201 Circuit Theory I
Types of Inductors ECE 201 Circuit Theory I