We know that conducting materials can be heated by electromagnetic induction. Is it possible to generate current using a cooling process?

  • $\begingroup$ No. Why would you think so? $\endgroup$ – ACuriousMind Jul 4 '14 at 14:21
  • $\begingroup$ see while cooling process is heat transfer process, so heat is transfered in metal by lattice vibration or electron transfer. if cooling material kept near coductor will current induce due to magnetic filed created by electron movement. $\endgroup$ – user52813 Jul 4 '14 at 14:26
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    $\begingroup$ Cooling a material does not generate directed electron movement (which would be a current), it just decreases the overall thermic movement. The heating of conductors through which current flows is really just a friction effect and has nothing to do with electromagnetism as such. $\endgroup$ – ACuriousMind Jul 4 '14 at 14:31
  • $\begingroup$ how much % of heat is transfered through electron transfer and is there specific temp. at which it is highest. $\endgroup$ – user52813 Jul 4 '14 at 15:01
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    $\begingroup$ how much percent of total heat transfer is through electron transfer. $\endgroup$ – user52813 Jul 4 '14 at 15:17

Short answer is: If you heat up the whole material, then no.

If you heat up the material in on end (an iron bar e.g.), then yes. The thermoelectric effect will cause a small current to flow between the two ends of different temperature.

It looks like you are mistakenly assuming that electromagnetic induction causes heating, which should then be possible to reverse. Well, the heating is more a side effect. It is caused by the resistance in the material. Whenever current flows - regardless of the cause - resistance in the material will cause heating. Electrons making up the current e.g. will bumb into the material atoms and transfer their energy to this material. Which is heat on the macro scale. This heat loss is an irreversible process - you cannot "put the heat back" to regain a current.


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