0
Resistance is the opposition to the flow of electric current in a circuit, measured in ohms. Impedance, on the other hand, refers to the total opposition to the flow of alternating current, which includes both resistance and reactance (due to inductance or capacitance). In simple terms, impedance takes into account both resistance and the effect of frequency on a circuit.
In 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.
Add your answer:
Earn +20 pts
The opposition of current is called?
"Opposition to current" can refer to resistance, reactance, or impedance.
Is impedance a vector or scalar quantity?
Impedance is a vector quantity because it has both a magnitude and a phase angle associated with it. The magnitude represents the resistance and reactance components, while the phase angle accounts for the relationship between the current and voltage in an AC circuit.
What is the relationship between current resistance and potential difference?
The first, and perhaps most important, relationship between current, voltage, and resistance is called Ohm's Law, discovered by Georg Simon Ohm and published in his 1827 paper, The Galvanic Circuit Investigated Mathematically. Ohm's principal discovery was that the amount of electric current through a metal conductor in a circuit is directly proportional to the voltage impressed across it, for any given temperature. Ohm expressed his discovery in the form of a simple equation, describing how voltage, current, and resistance interrelate:E = IRIn this algebraic expression, voltage (E) is equal to current (I) multiplied by resistance (R). Using algebra techniques, we can manipulate this equation into two variations, solving for I and for R, respectively: I = E/R and R = E/I.answer discovered that relation only after VOLTA establish the voltage relationship and AMPERE discovered the current relationship. and of course WATTS establish the power.521R=VResistanceOHMSoli
What is the unit of a impidance?
Impedance is expressed in units of 'ohms'.In a DC situation, impedance is simply the scalar resistance.In a circuit where voltage/current have time-varying components,impedance is a complex quantity, with both magnitude and angle.
What stops the current flowing in a circuit?
The resistance in the circuit opposes the flow of current, causing it to decrease. Additionally, an open circuit or a break in the circuit will stop the current flow altogether.
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.
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'.
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 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.
