Resistance vs Impedance-difference between Resistance and Impedance
This page on Resistance vs Impedance describes basic difference between Resistance and Impedance.
Following table mentions comparison between resistance and impedance terms.
Resistance | Impedance |
---|---|
It is the opposition to flow of DC current. | It is the opposition to flow of AC current. |
It is measured in Ohm. | It is also measured in Ohm. |
It is measured by Ohm meter or multimeter. | It is measured by Impedance meter. |
Denoted by 'R' in the circuit. | Denoted by 'Z' in the circuit. Where in, Z = R + jX (cartesian form), Z = |Z|e^{j*arg(z)} (polar form) |
Inverse of R is known as conductance(G), G=1/R. | Inverse of Z is known as admittance(Y), Y =1/Z. |
It does not depend on frequency.
Resistance of material varies with temperature. R =V/I as per Ohm's Law |
Impedance depends on Frequency, Z = R, Phase angle=0 Z = X_{L}=W*L, Phase angle=90 Z= X_{C}=1/W*C, Phase angle=-90 For R-L Circuit, Z = { R^{2} + (X_{L})^{2} }^{0.5}..0 degree<f<90 degree For R-C Circuit, Z = { R^{2} + (X_{C})^{2} }^{0.5}.-90 degree<f<0 degree For R-L-C circuit, Z = [ R^{2} + {(X_{L})-(X_{L})}^{2} ]^{0.5} |
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