**Resistance**is a concept used for DC (direct currents) whereas

**impedance**is the AC (alternating current) equivalent.

**Resistance**is due to electrons in a conductor colliding with the ionic lattice of the conductor meaning that electrical energy is converted into heat.

What is the unit of measurement for impedance?

Reactance is mathematically symbolized by the letter “X” and is

**measured in**the unit of ohms (Ω).**Impedance**is a comprehensive expression of any and all forms of opposition to electron flow, including both resistance and reactance. It is present in all circuits, and in all components.1

## What is the active power?

**Active power**does do work, so it is the real axis. Apparent

**power**is conventionally expressed in volt-amperes (VA) since it is the product of rms voltage and rms current. The unit for reactive

**power**is expressed as var, which stands for volt-ampere reactive.

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## What is the difference between reactance and resistance?

**Resistance**and

**Reactance**are not much

**different**from each other. The opposition offered to a dc current

**in a**circuit by a

**resistor**is defined as

**resistance**.

**Reactance**is the effective

**resistance**offered by a capacitor or an inductor

**in an**ac circuit.

3

## What is impedance in music?

**Impedance**is something that everyone who records or plays

**music**should know about. It comes in to play every time we plug in an instrument, microphone, device, or speaker. Yet, most people who record know little or nothing about it. The word

**impedance**is often represented with the letter Z, and is measured in ohms (Ω).

4

## What do you mean by ohmic resistance?

Materials and components that obey Ohm's law are described as "

**ohmic**" which means they produce the same value for**resistance**(R = V/I) regardless of the value of V or I which is applied and whether the applied voltage or current is DC (direct current) of either positive or negative polarity or AC (alternating current).5

## What is the unit of acoustic impedance?

The SI unit of acoustic impedance is the

**pascal second**per cubic**metre**(Pa. s/m^{3}) or the rayl per square**metre**(rayl/m^{2}), while that of specific acoustic impedance is the**pascal second**per**metre**(Pa. s/m) or the rayl. In this article the symbol rayl denotes the MKS rayl.6

## What is the inductive reactance of A?

**Inductive reactance**is the name given to the opposition to a changing current flow. This impedance is measured in ohms, just like resistance. In inductors, voltage leads current by 90 degrees.

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## What is series impedance?

Electrical

**impedance**is the measure of the opposition that a circuit presents to a current when a voltage is applied.**Impedance**extends the concept of resistance to AC circuits, and possesses both magnitude and phase, unlike resistance, which has only magnitude.8

## Is resistance impedance?

**Resistance**is a concept used for DC (direct currents) whereas

**impedance**is the AC (alternating current) equivalent.

**Resistance**is due to electrons in a conductor colliding with the ionic lattice of the conductor meaning that electrical energy is converted into heat.

9

## What is total impedance?

The

**total impedance**is not simply the algebraic sum of resistance and inductive reactance. Since the inductive reactance is 90 degrees out of phase with the resistance and, therefore, their maximum values occur at different times, vector addition must be used to calculate**impedance**.10

## How do you measure the impedance?

Reactance is mathematically symbolized by the letter “X” and is

**measured**in the unit of ohms (Ω).**Impedance**is a comprehensive expression of any and all forms of opposition to electron flow, including both resistance and reactance. It is present in all circuits, and in all components.11

## What do you mean by impedance triangle?

**Impedance Triangle**- Is used to calculate

**Impedance**when resistance (R), Inductance (L) and Capacitance (C) are all present in the circuit, and the total reactance (X) is the difference between the Inductive Reactance (XL) and Capacitive Reactance (XC).

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## What do you mean by impedance matching?

In electronics,

**impedance matching**is the practice of designing the input**impedance**of an electrical load or the output**impedance**of its corresponding signal source to maximize the power transfer or minimize signal reflection from the load.13

## What is the difference between resistance and impedance?

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.**Impedance**can therefore be thought of as the opposition of electrical current flow in a AC circuit.14

## What is meant by impedance diagram?

**Impedance**And Reactance

**Diagrams**. In such cases, the system is represented with single line or one line

**diagram**, and then drawing equivalent simplified

**impedance**and reactance

**diagrams**to analyze and calculate in an easy way. For example, consider a simple power system represented in one line

**diagram**.

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## What is impedance in circuit?

**Impedance**, denoted Z, is an expression of the opposition that an electronic component,

**circuit**, or system offers to alternating and/or direct electric current.

**Impedance**is a vector (two-dimensional)quantity consisting of two independent scalar (one-dimensional) phenomena: resistance and reactance.

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## What is an impedance test?

**Impedance Testing**. This is a procedure during which your doctor inserts a small catheter into your esophagus which measures both acidic and non-acidic reflux in your esophagus over 24 hours. For more information visit:

**Impedance Testing**.

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## What is the meaning of input impedance?

The

**input impedance**of an electrical network is the measure of the opposition to current flow (**impedance**), both static (**resistance**) and dynamic (reactance), into the load network being that is external to the electrical source.18

## What is the impedance of an RLC circuit?

The

**RLC**series**circuit**is a very important example of a resonant**circuit**. It has a minimum of**impedance**Z=R at the resonant frequency, and the phase angle is equal to zero at resonance.19

## Do capacitors have impedance?

The

**impedance**of an ideal**capacitor**is equal in magnitude to its reactance, but these two quantities**are**not identical. Reactance is a more straightforward value; it tells you how much resistance a**capacitor**will**have**at a certain frequency.**Impedance**, however, is needed for comprehensive AC circuit analysis.