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Resistance is a concept used for DC (direct currents) whereas impedance is the AC (alternating current) equivalent. Resistance and impedance have different fundamental origins even though the calculation for their value is the same:
R=V/I
Wiki User
∙ 11y ago
Wiki User
∙ 8y agoIn AC circuits, "impedance" generalizes "resistance" by Anon User is a sensible statement giving the angle they are trying to get at, but slightly misleading in my opinion, i would personally say people use Resistance to generalise Impedance.
I would like to clarify further the differences for you, in a more simplistic way, this helped me understand fundamental principles early.
- Resistance is the opposition of electrical current flow.
- Resistance occurs in AC & DCcircuits.
- In addition to Resistance, AC circuits also exhibit Reactance.
- Reactance is also the opposition to electrical current flow.
- By its very nature a DC circuit will not exhibit any form of Reactance, therefore opposition to current flow will always be measured in Resistance.
- Reactance exists in two forms, Capacitive & Inductive.
- the combination of Reactance & Resistance is called Impedance
- Impedance can therefore be thought of as the opposition of electrical current flow in a ACcircuit.
- Due to the nature of AC circuits Reactance is always present (even if only in infinitesimal amounts)
- Any measurement of the opposition of current flow in an AC circuit will always be measured in Impedance.
- Impedance & Resistance are both measured in Ohms, and are interchangeable in many electrical formulas in practice i.e, Ohms Law.
- As a simplistic general view, Impedance can be thought of as Resistance in an AC circuit.
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What is a measure of an object's ability to transmit electricity.?
Resistance (or impedance).
What stops the current flowing in a circuit?
Current will cease when either or both the potential difference across the load is Zero or when the load, itself, is Infinite in resistance or impedance.
Difference between wrinkle free and wrinkle resistance?
Wrinkle free and wrinkle resistance sounds same but there is some difference .
The property of a conductor that impedes the flow of charge is called?
Resistance or impedance.
What happens to the resistance when the frequency is doubled?
Impedance of a coil or a capacitor does depend on the excitation frequency,but resistance has no relationship to frequency.
A battery of emf 2V is connected to an external resistance which is equal to its internal resistance and then find potential difference across the external resistance?
As the source impedance is equal to load impedance, it is assumed that both the resistances are in series. This distributes the whole voltage equally between both the impedance. Hence the PD across external resistance will be 1V.
What is the Difference between low and high impedance relays?
It depends on the resistance level in that area if the soil have low resistance then they will use high impedance system and vice versa..so reason behind this have to reduce fault current.
What is difference between impedance and reactance?
Impedance is the net reactance(for Capacitors and inductors in the circuit) / Resistance of the circcuit whereas reactance is the prperty of the individual passive components ( only capacitors n inductors) to resist the flow of charge.
What are the difference between LCR meter and electrochemical impedance spectroscopy?
LCR meter is a device. And electrochemical impedance spectroscopy is a method. So the difference between them are like the difference between pen and writing.
What is impedance diagram?
An impedance diagram (sometimes called an impedance triangle) results when a series circuit's voltage phasor diagram is divided throughout by its reference phase (current) -this results in resistance (=VR/I), inductive reactance (=VL/I), capacitive reactance (=VC/I) and impedance (=V/I) andillustrates the Pythagorean relationship between the circuit's impedance, reactance, and resistance.
Is impedance and resistance are different?
Resistance is a concept used for DC (direct currents) whereas impedance is the AC (alternating current) equivalent. Impedance is a more general term for resistance that also includes reactance.
What is meant by the equivalent impedance of a parallel ac circuit?
This is similar to "equivalent resistance", but impedance is a more accurate concept in the case of AC.The equivalent resistance (or equivalent impedance) means that if you replace all the resistances under consideration with one equivalent resistance, the result on the circuit will be the same.This is similar to "equivalent resistance", but impedance is a more accurate concept in the case of AC.The equivalent resistance (or equivalent impedance) means that if you replace all the resistances under consideration with one equivalent resistance, the result on the circuit will be the same.This is similar to "equivalent resistance", but impedance is a more accurate concept in the case of AC.The equivalent resistance (or equivalent impedance) means that if you replace all the resistances under consideration with one equivalent resistance, the result on the circuit will be the same.This is similar to "equivalent resistance", but impedance is a more accurate concept in the case of AC.The equivalent resistance (or equivalent impedance) means that if you replace all the resistances under consideration with one equivalent resistance, the result on the circuit will be the same.
Relationship between resistance and capacitive reactance?
There is no physical relationship between resistance and capacitive reactance. But if someone tells you that the impedance of something: Z = 3 -4j, the real resistance is 3 and the reactive capacitance is -4.
What is the impedence?
Impedance is the complex form of resistance. Impedance takes into account capacitance and inductance in a circuit as well. Impedance can be represented as resistance as a function of frequency.See link.AnswerImpedance is not a 'complex form of resistance'. It is the vector sum of a circuit's resistance and reactance. In electrical engineering, 'resistance' has a very specific meaning, and cannot be used to denote 'opposition'.
What is impedance triangle?
An impedance triangle has resistance (always positive) in the x axis and reactance (at a right angle to resistance) in the y axis. The line that completes this triangle (the hypotenuse) is the absolute value of the impedance.
What is bootstraping in darlington emitter follower?
Connecting a resistance btw the o/p and i/p of the amplifier to increase the i/p impedance is called bootstrapping..
What are the factors that affect the difference between the computed values and measured values?
-- rounding errors in computation -- non-ideal components, such as diodes with finite reverse resistance, inductors with resistance, power supplies with non-zero internal impedance, wire with inductance, etc.
