Electronics Engineering
Temperature
Thermodynamics and Statistical Mechanics

# Is resistivity of a conductor temperature dependent?

012 ###### 2016-09-30 12:39:47

For some materials, yes, for some materials, no.

The temperature coefficient of resistivity of different materials can be negative, zero, or positive.

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## Related Questions The resistance of a conductor is directly proportional to the resistivity of the conductor. since the resistivity of a conductor is decreases with decrease in temperature hence the resistance. Resistivity is the intrinsic property of a conductor, and it is independent of the size of that conductor. Resistance is an extrinsic property that makes it dependent upon the amount of the material that there is present. As light falls on the conductor then emission of electrons would increase the conductivity and so its resistivity decreases. Such a conductor is known as light dependent resistor. Resistance is affected by the length and cross-sectional area of a conductor, together with the resistivity of that conductor. As resistivity is affected by temperature, you can also say that resistance is indirectly affected by temperature. There are three, not four, factors that determine the resistance of a conductor. These are the length of a conductor, its cross-sectional area, and its resistivity.As resistivity is affected by temperature, you could say that temperature indirectly affects resistance but, strictly, temperature is affecting the resistivity not the resistance -which is why it is not considered a 'fourth' factor.So, resistance = resistivity x (length/area) Resistivity is a constant for any particular material, and independent of that material's physical dimensions or shape. However, it does vary with temperature which is why resistivity is always quoted at a particular temperature. Variations in resistivity due to temperature change is the reason that the resistance of a material varies with temperature. In SI, resistivity is expressed in ohm metres. resistivity is the resistance of unit specimen. resistance means the whole resistance offered by the conductor . resistivity depends only on temperature but not on shape and size of the conductor .( if we compare with mass and density, resistivity can be compared with density and resistance can be compared with mass) There are really only three things that affect electrical resistance. They are the length and cross-sectional area of a conductor and its resistivity. However, resistivity depends not only on the material from which the conductor is manufactured, but upon its temperature. So you could say that temperature indirectly affects resistance via its resistivity. For pure metal conductors, their resistivity increases with temperature. As a result, their resistance will increase with temperature. Resistance is directly proportional to the resistivity and length of the conductor, and inversely-proportional to its cross-sectional area. As resistivity is affected by temperature, we can say that temperature indirectly affects resistance. Temprature increase the resistivity of a metal as electrons has to travel further against the thermal temprature as increase in temprature will increase the diffussion of electrons while in semi conductor this is dependent on the electric field intensity and charge carrier either n type or p type. Change its length, its cross-sectional area, or the material from which it is made (i.e. its resistivity). As temperature affects its resistivity, a change of temperature will also affect the resistance. A superconductor has zero electrical resistivity below a specific temperature called the superconducting transition temperature. The value for resistivity will remain unchanged (provided temperature remains constant). Resistivity is a property of the material. The resistance, however, will double. Remember that resistance is directly proportianal to the length of the conductor and inversely proportional to the cross-sectional area of the conductor.  its basicly a conductor that is below a certain temp. A superconductor is a material with an extremely low electrical resistivity (up to zero) under a specific temperature. There are four, factors that affect the resistance of a wire.-Temperature-cross-sectional area-length-kind of materialIt is a misconception to think that temperaturedirectly affects resistance. It doesn't! What temperature affects is the conductor's resistivity. In some cases, a rise in temperature will increase the resistivity which, in turn, causes the resistance to increase. But in other cases, an increase in temperature can cause the resistivity to fall, or it might have very little effect at all on the resistivity. How temperature affects resistivity is a function of the resistivity. It's more accurate to say, therefore, that temperature indirectlyaffects resistance by varying the resistivity. Super conductor will have zero resistance or zero resistivity. This happens when the temperature of the conductor reaches a very low temperature known as critical super conducting transition temperature. In case of mercury it will be 4.2K. Paper is bad conductor of electricity. It's resistivity is same as that of wood. A material is said to be superconductors when it becomes a perfect conductor at very low temperature with zero resistivity. Resistance is affected by the length, cross-sectional area, and resistivity of the conductor. The resistivity, in turn, is affected by temperature. So only by changing one of these four factors will the resistance of a conductor change. Changing voltage will have no affect upon the conductor's resistance. The phrase "best conductor" is somewhat deceptive because conductance is often associated with resistivity. As an example, some consider Silver to be a better conductor than Gold because it has a slightly lower resitivity, but fail to take temperature into account. When electrical current passes through a conductor, it causes the conductor to heat up. As Silver heats up, it's resistivity remains relatively constant, but as Gold heats up, it's resistivity drops. So at room temperature, Silver appears to be a better conductor than Gold, but in pratice, Gold conducts better than Silver. Currently there is a new material known as Graphene that may turn out to be an even better conductor than either Gold or Silver. So when asked which conductor is best, the answer may soon be Graphene, followed by Gold, followed by Silver. Unless of course you mean "Which conductor has the lowest resistivity at room temperature?" Nothing. Resistivity, expressed in ohm metres, is a constant for any particular conductor although it is affected by temperature. Length, cross section, material, temperature.AnswerWithout wishing to sound pedantic, there are only threefactors that affect resistance. These are the length, cross-sectional area, and resistivity of a material. Temperature affects resistivity. It is the change of resistivity (of a material) per degree of whichever temperature scale you are using.

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