Explain temperature dependency in conductors, Electrical Engineering

Explain temperature dependence of electrical conductivity and resistivity in conductors.

When the temperature is increased, there is a greater thermal motion in atoms that reduces the regularity in the atoms spacing along with a consequent reduces in the mobility of the electrons. Therefore the resistivity of most of the conductors increases along with an increase in the temperature. Because the number and the energy of the electrons at top of the Fermi distribution curve vary insignificantly along with temperature, change in temperature should be related with a change in the mean free path. Within a perfectly regular lattice, all electrons will exist in a particular energy state and they will have a fixed velocity. Basically in practical way metals do not have a perfect lattice due to impurities and deviations of the atoms about their mean positions because of lattice oscillations. Because the lattice oscillations decreases at low temperature the scattering of electron waves falls and therefore the conductivity increases quickly as the temperature reaches absolute zero. There is a limiting value beyond that the conductivity will not increase. Generally, purer the specimen higher is the conductivity. The conductivity of several conductors decreases linearly as the temperature is raised above the room temperature but below that temperature the conductivity raises markedly.

Posted Date: 5/21/2013 5:28:40 AM | Location : United States







Related Discussions:- Explain temperature dependency in conductors, Assignment Help, Ask Question on Explain temperature dependency in conductors, Get Answer, Expert's Help, Explain temperature dependency in conductors Discussions

Write discussion on Explain temperature dependency in conductors
Your posts are moderated
Related Questions
Q. What is Trans conductance? It is ratio of small change in drain current to the corresponding change in the gate-to-source voltage for a constant gate-to-source voltage .it i

Q. What is a clipper circuit? Clipping circuits are linear wave shaping circuits. The main function of 'clipper' is that it clips off a part of input waveform i.e., it cut off

Q. A 15-kVA, 2200:220-V, two-winding, single- phase transformer is connected as an autotrans- former to step up voltage from 220 V to 2420 V. Without exceeding the rated current of

We have seen that a practical power source may be modelled by an ideal constant voltage source in series with a resistor - a Thevenin equivalent circuit Alternati

Q. Write a note on feedback of emitter follower? The emitter follower can be seen to be an example of negative feedback when the relationship is put in the form


Q. A 345-kV, 60-Hz, three-phase transmission line delivers 600 MVA at 0.866 power factor lagging to a three-phase load connected to its receiving- end terminals. Assuming that the

Ionic Bonding Instance: NaCl. Na (Z = 11) gives up the outermost shell electron of it to Cl (Z=17) atom, so the crystal is build up of ions with the electronic structure

Gate terminal - field-effect transistor: The names of the terminals consider to their functions. The gate terminal might be thought of since controlling the opening and closin

AC and DC distribution onboard ships