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Impedance (Z) is the vector sum of a circuit's resistance (R) and reactance(X), is expressed in ohms, and is the total opposition to current in an a.c. circuit.
Resistance, expressed in ohms, depends upon the length, cross-sectional area, and resistivity of the conductor.
Reactance, expressed in ohms, can be inductive reactance (XL), capacitive reactance(XC), or a combination (vector sum) of the two.
- Inductive reactance is directly proportional to the circuit's inductance and the supply frequency.
- Capacitive reactance is inversely proportional to the circuit's capacitance and the supply frequency.
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