define and differentiate resistance, reactance,reluctance,impedence?

Answer 1

All four terms are electrical engineering parameters. Resistance, reactance, and impedence are terms which describe the performance of an electrical circuit, although the concept of impedance also applies to free space propagation of electromagnetic radiation (ie - free space impedance is usually 377 Ohms). Reluctance is a unit measuring the opposition to the flow of magnetic flux within magnetic materials and is analogous to resistance in electrical circuits.

For electronic circuits, the following is true:

Z = R + jX

In this equation, Z is the impedance , R is the resistance, and X is the reactance. All three quantities are measured in Ohms. The resistance measures the opposition to the flow of current within an electrical circuit. This is a complex equation in which the resistance is the real term and the reactance is the imaginary term. The impedance is a phasor which has both a magnitude and a phase component. The magnitude and phase are given by:

Zmag = sqrt(R*R + X*X)
Zphase = arctan (X/R)

The reactance is an energy storage term and arises from inductance and capacitance in the circuit. Inductance, L, measured in Henries, has a reactance given by:

XL = 2 * pi * f * L where w represents the frequency in Hertz, pi = 3.14..., and L is the inductance in Henries.

Capacitance, C, is measured in Farads and has reactance given by:

Xc = 1/(2 * pi * f * C)

Note that reactance is dependent upon frequency. The reactance will change with frequency which means the impedance also will change with frequency. The reactance of an inductor goes to 0 Ohms (also called a short) at DC and infinite Ohms (also called open) at very high frequencies. The reactance of capacitors will go to infinity (open) at DC and 0 Ohms (short) at high frequencies.

In general, capacitance will have a negative reactance and inductance will have a positive reactance so that
Z = R + jX is inductive and Z = R - jX is capacitive.

The inverse of resistance is conductance and similar concepts apply to magnetic circuit using the terms reluctance and permeance.

Hope this helps!!

Answer 2

Resistance - A measure of the degree to which a body opposes the passage of electric current.

Reactance - Opposition to the flow of electric current resulting from inductance and capacitance. Essentially, it can be thought of as the AC resistance.

Reluctance - The opposition to magnetic flux.

Impedance - The total opposition that a circuit offers to the flow of alternating current or any other varying current at a particular frequency.

Answer 3

Resistance may refer to:

In medicine or biology:

Antibiotic resistance, the ability of a microorganism to withstand the effects of an antibiotic
Disease resistance, in immunology; see also disease resistance in fruit and vegetables
Pesticide resistance
In business, change management, psychology and psychotherapy:

Resistance to change, the manner in which a person appears to be unable or unwilling to adopt suggestions or explore avenues suggested by an authority figure or advisor.
In physics, a force that tends to oppose motion:

Friction, the force that opposes the relative motion
Air resistance, fluid or gas forces opposing motion and flow
Geological resistance, a measure of how well minerals resist erosive factors
Fluid resistance / drag / hydraulic conductivity
Thermal resistance, a temperature difference
Electrical resistance, a measure of the degree to which an object opposes the passage of an electric current
a Resistance movement, a non-military group or collection of individual groups fighting against foreign occupation:

Resistance during World War II movement during World War II
French Resistance, a notable example of a World War II Resistance movement
Resistance (socialist youth organisation), a Marxist-oriented socialist youth organisation in Australia
other:

the HMS Resistance a Royal Navy battleship 1859-1940
In fiction:

Resistance (V TV series), humans against an alien takeover in the V television series.
Resistance Records, a white power music label
Resistance (technical analysis), in security trading
Resistance welding, a group of welding processes
Resistance: Fall of Man, a first-person shooter for the PlayStation 3
inner resistance
Psychodynamic resistance

Answer 4

all are different
resistance= when dc current is supplied whatever resist its flowing is resistence
reactance=resistance of ac current
impedence=lcr circuits resistance

Answer 5

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