resistance

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resistance,

in biology: see immunityimmunity,
ability of an organism to resist disease by identifying and destroying foreign substances or organisms. Although all animals have some immune capabilities, little is known about nonmammalian immunity.
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.

resistance,

in psychiatry: see psychoanalysispsychoanalysis,
name given by Sigmund Freud to a system of interpretation and therapeutic treatment of psychological disorders. Psychoanalysis began after Freud studied (1885–86) with the French neurologist J. M.
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.

resistance,

property of an electric conductor by which it opposes a flow of electricity and dissipates electrical energy away from the circuit, usually as heat. Optimum resistance is provided by a conductor that is long, small in cross section, and of a material that conducts poorly. Resistance is basically the same for alternating and direct current circuits (see impedanceimpedance,
in electricity, measure in ohms of the degree to which an electric circuit resists the flow of electric current when a voltage is impressed across its terminals.
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). However, an alternating current of high frequency tends to travel near the surface of a conductor. Since such a current uses less of the available cross section of the conductor than a direct current, it meets with more resistance than a direct current. In circuit analysis an ideal resistorresistor,
two-terminal electric circuit component that offers opposition to an electric current. Resistors are normally designed and operated so that, with varying levels of current, variations of their resistance values are negligible (see resistance).
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, i.e., a circuit component whose only property is resistance, is called a resistance. The phenomenon of resistance arises from the interactions of electrons with ions in the conductor. The unit of resistance is the ohmohm
[for G. S. Ohm], symbol Ω, unit of electrical resistance, defined as the resistance in a circuit in which a potential difference of one volt creates a current of one ampere; hence, 1 ohm equals 1 volt/ampere. The megohm (1,000,000 ohms) and the milliohm (.
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. See superconductivitysuperconductivity,
abnormally high electrical conductivity of certain substances. The phenomenon was discovered in 1911 by Heike Kamerlingh Onnes, who found that the resistance of mercury dropped suddenly to zero at a temperature of about 4.
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; Ohm's lawOhm's law
[for G. S. Ohm], law stating that the electric current i flowing through a given resistance r is equal to the applied voltage v divided by the resistance, or i=v/r.
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; conductionconduction,
transfer of heat or electricity through a substance, resulting from a difference in temperature between different parts of the substance, in the case of heat, or from a difference in electric potential, in the case of electricity.
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.

Resistance

The physical property of a material to resist or impede the conduction of electrical current, measured in ohms. High resistance means poor conductivity and vice versa.

resistance

[ri′zis·təns]
(acoustics)
(electricity)
The opposition that a device or material offers to the flow of direct current, equal to the voltage drop across the element divided by the current through the element. Also known as electrical resistance.
In an alternating-current circuit, the real part of the complex impedance.
(fluid mechanics)
(mechanics)
In damped harmonic motion, the ratio of the frictional resistive force to the speed. Also known as damping coefficient; damping constant; mechanical resistance.

electrical resistance

The physical property of a device, conductor, element, branch, or system, by virtue of which power is lost as heat when current flows through it; the physical property which an electric conductor exhibits to the flow of current; measured in ohms.

resistance

1. 
a. the opposition to a flow of electric current through a circuit component, medium, or substance. It is the magnitude of the real part of the impedance and is measured in ohms.
b. (as modifier): resistance coupling
2. any force that tends to retard or oppose motion
3. (in psychoanalytical theory) the tendency of a person to prevent the translation of repressed thoughts and ideas from the unconscious to the conscious and esp to resist the analyst's attempt to bring this about
4. Physics the magnitude of the real part of the acoustic or mechanical impedance
References in periodicals archive ?
On July 1, Mahmoud al-Zahar, a founding member of Hamas, said the resistance movement would respond to any threats from the terrorist group after militants from the ISIL threatened to attack the Palestinian resistance movement in a 16-minute video released earlier in the day.
Still, the resistance movement against targets like the WTO has been so successful that countries like the U.
Conversely, the Danish resistance movement was surprisingly effective; the El Salvador strike ousted an odious dictator; and the Solidarity campaign, while only partially successful in the short term, created the conditions for a definitive victory just a few years later.
The Iranian deputy foreign minister noted that Iran had never been, nor would it ever be, negligent in supporting Palestine and resistance movements.
Hizbullah considers any attack on any faction of the resistance movements or on the two supporting nations of Iran or Syria, as an attack on all of them," he said.
At Michigan State, we believe that a case can be made for the second theory -- the implementation of both single and multi-joint resistance movements with a multitude of modalities.
The two Palestinian resistance movements, Hamas and Islamic Jihad, also vowed to avenge the Israeli attack.
This court ruling also targets all Palestinian resistance movements because Hamas has spearheaded the Palestinian resistance," said senior Hamas official Mushir al-Masri in an address to the protesters.
TEHRAN (FNA)- Commander of the Islamic Revolution Guards Corps (IRGC) Major General Mohammad Ali Jafari warned Tel Aviv of the devastating response of the regional resistance movements to Israel's recent air raid on the Syrian Golan Heights that killed several Hezbollah members and an Iranian military adviser.
He reiterated that the issue of Palestine has always topped agenda of Iran's foreign policy, and said, "Iran has always had an established stance on the resistance movements in Palestine.