1. Inductance is the relationship between the current and the magnetic field generated in a coil. Each is proportional to the delta of the other.
L = ( d2 n2) / l + 9.45d
d is diameter of coil in meters
n is number of coil turns
l is length of coil in meters
2. Resistance (R) is not affected by AC voltage or current frequency and remains the same for AC/DC.
R = V / I
3. Reactance (X) or Back EMF is the opposition to current flow in relation to the current frequency
a) Inductive reactance (XL) rises with an increase in frequency -
2πƒL
b) Capacitive reactance (XC) falls with a increase in frequency -
1/2πƒC
4. Impedance describes the combined effect of resistance (R), inductive reactance (XL) and capacitive reactance (XC) in an AC circuit
For DC circuit = Z = √ ( R² + (XC²) )
For AC circuit = Z = √ ( R² + (XL - XC)² )
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