Difference Between Resistance and Impedance
Difference
Between Resistance and Impedance
The Difference Between Resistance and Impedance is
explained below keeping in mind the various factors like the basic definition
of resistance and impedance, a type of circuit they work in, elements on which
they depends, their symbolic representation, real and imaginary numbers, the
effect of frequency on them, phase angle, power dissipation and energy stored.
Difference Between Resistance and
Impedance are given below in the tabulated form.
BASIS

RESISTANCE

IMPEDANCE

BASISDefinition

RESISTANCEThe
opposition offered to the flow of current in an electric circuit is known as
the Resistance.

IMPEDANCEThe
opposition offered to the flow of current in an AC circuit because of
resistance, capacitance and inductance is known as Impedance.

BASISCircuit

RESISTANCEResistance
occurs in both AC and DC circuit.

IMPEDANCEImpedance
occurs only in an AC circuit.

BASISElements

RESISTANCEIt
is the contribution of the resistive element in the circuit.

IMPEDANCEIt
is the contribution of both resistance and reactance.

BASISSymbol

RESISTANCEIt
is denoted by R

IMPEDANCEIt
is denoted by Z

BASISReal
and Imaginary Value

RESISTANCEResistance
is a simple value consisting of only real numbers. Eg: 3.4 ohms, 6.2 ohms
etc.

IMPEDANCEImpedance
is a complex value consisting of real and imaginary values. Eg: R+ij

BASISFrequency

RESISTANCEResistance
is constant in a circuit and does not vary according to the frequency of AC
or DC.

IMPEDANCEImpedance
varies according to the frequency of AC current.

BASISPhase
angle

RESISTANCEResistance
does not have any phase angle.

IMPEDANCEImpedance
have magnitude and phase angle.

BASISPower
Dissipation & energy stored

RESISTANCEIt
only represents power dissipation in any material if kept in an
electromagnetic field.

IMPEDANCEIf
kept in an electromagnetic field it represents both power dissipation and
energy stored.

Resistance is simply defined as the
opposition to the flow of electric current in the circuit.
Impedance is opposition to the flow
of AC current because of any three components that is resistive, inductive or
capacitive. It is a combination of both resistance and reactance in a circuit.
The various Difference
Between Resistance and Impedance are described below in detail.
§ The opposition offered to the flow
of current in an electric circuit whether AC or DC is known as the Resistance.
The opposition offered to the flow of current in an AC circuit because of
resistance, capacitance and inductance is known as Impedance.
§ Resistance occurs in both AC and DC
circuit, whereas Impedance takes place only in an AC circuit.
§ Resistance is the contribution of
the resistive element in the circuit, whereas the contribution of both
resistance and reactance forms Impedance.
§ Resistance is denoted by (R)
whereas impedance by (Z).
§ Resistance is a simple value
consisting of only real numbers. Example: 3.4 ohms, 6.2 ohms etc. Impedance
comprise of both real and imaginary numbers. Example: R+ij, where R is a real
number and ij is imaginary part.
§ The Resistance of the circuit does
not vary according to the frequency of AC or DC, whereas Impedance varies with
the change in frequency.
§ Impedance have both magnitude and
phase angle, whereas Resistance does not have phase angle.
Resistance if kept in an electromagnetic field
represents power dissipation in any material. Similarly, if Impedance is
subjected to magnetic field it represents both power dissipation and energy
storage.
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