define impedence?

Question

related to current

Answer 1

(m)

Electrical impedance, or simply impedance, is a measure of opposition to a sinusoidal alternating electric current. The concept of electrical impedance generalizes Ohm's law to AC circuit analysis. Unlike electrical resistance, the impedance of an electric circuit can be a complex number, however, like resistance, the unit of impedance is the ohm. Oliver Heaviside coined the term "impedance" in July of 1886.

Answer 2

In electrical engineering, impedance is a measure for the manner and degree a component resists the flow of electrical current if a given voltage is applied. It is denoted by the symbol Z and is measured in ohms. Impedance differs from simple resistance in that it takes into account possible phase offset (see below). The concept of impedance also has significance outside of electrical systems in the discussion of any driven oscillator. In July of 1886, Oliver Heaviside coined this term.

Answer 3

Impedance is a material's opposition to the flow of electric current; measured in ohms.

Electrical impedance, or simply impedance, is a measure of opposition to a sinusoidal alternating electric current. The concept of electrical impedance generalizes Ohm's law to AC circuit analysis. Unlike electrical resistance, the impedance of an electric circuit can be a complex number, however, like resistance, the unit of impedance is the ohm. Oliver Heaviside coined the term "impedance" in July of 1886.

Characteristic impedance of vaccum : Zo = 376.73 ohms

The acoustic impedance Z (or sound impedance) is the ratio of sound pressure p to particle velocity v in a medium or acoustic component. Z can be either measured in its constituent units (pressure per velocity) or in rayls.

Answer 4

In simple,Electrical impedance is a measure of opposition to a Alternating electric current.

It is the resultant of the Resistive, Inductive & Capacitive reactance offered to the flow of Currents in a AC system.

It is analogus to the Resistance in the case of DC systems.

Answer 5

Impedance is the reactance offered to the free flow of alternating current.

Answer 6

Symbol Z A measure of the total opposition to current flow in an alternating current circuit, made up of two components, ohmic resistance and reactance, and usually represented in complex notation as Z = R + iX, where R is the ohmic resistance and X is the reactance.
An analogous measure of resistance to an alternating effect, as the resistance to vibration of the medium in sound transmission.

Answer 7

Hii dear,
It is the opposition offered for the flow of current in a circuit.
In an ac circuit it is the resultant of opposition offered by; capacitors ie.capacitive reactance, inductors ie. inductive reactance and resistance. In a dc ckt. impedance is same as resistance as inductive and capacitive reactances dosen't come in to play.
Refer any physics or electrical engg text for details.

Answer 8

impedence is opposition to alternating current just like how Resistance is for direct current. since alternating current is sinusoidal, the impedence may not just be a number like resistance. It couled be a complex number too.
so basical it is another form of resistance to the passing of current

Answer 9

The total opposition that a circuit offers to the flow of alternating current or any other varying current at a particular frequency. It is a combination of resistance R and reactance X, measured in ohms.

Answer 10

impedence is the net resistance offered by a circuit.....
the circuit might hav any combinations of a resistor,capacitor or an inductor....
z(impedence)
=sqrt[r^2+(x'-x")^2]...

is the general eqn of impedence....
where x'=resistance of inductor...
x"=resistane of capacitor....
[their resistance are called reactance]