Difference Between Resistance and Impedance

 7 Differences Between Resistance and Impedance

S.NO.	Resistance	Impedance
1.	Resistance is a measure of how difficult it is for electric current to flow through a conductor.	Impedance is a measure of the overall opposition to current flow in an electric circuit.
2.	Resistance is a scalar quantity, meaning it has only magnitude.	Impedance is a complex quantity, meaning it has both magnitude and phase.
3.	The unit of measurement for resistance is the ohm (Ω).	The unit of measurement for impedance is also the ohm.
4.	Resistance is a property of a conductor.	Impedance is a property of an entire circuit and is affected by the inductance and capacitance of the circuit in addition to the resistance of the conductor.
5.	Resistance is always a positive value.	Impedance can be positive or negative depending on the phase of the current and voltage in the circuit.
6.	Resistance is a measure of the opposition to DC (direct current) flow.	Impedance is a measure of the opposition to AC (alternating current) flow.
7.	Resistance is a passive property of a conductor.	Impedance is an active property of a circuit that can be changed by adjusting the components of the circuit.

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