1. Physical Characteristics of Inductors
ECE 201 Circuit Theory I

2. 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

3. 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

4. Winding Capacitance, CW
Stray capacitance due to two conductors placed side – by – side.
ECE 201 Circuit Theory I

5. 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

6. Inducing a Voltage by Moving a Magnet
ECE 201 Circuit Theory I

7. 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

8. Types of Inductors
ECE 201 Circuit Theory I