Answer Posted / ashwin

The two dissimilar metals behave or contribute a thermocouple. A thermocouple is a junction between two dissimilar metals when subjected to heat generates voltage. This is seebeck effect. The inverse of this effect is Peltier effect. When current is passed through a junction containing two dissimilar metals heat is generated.

For more details on the principle of thermocouple go to link below:

http://en.wikipedia.org/wiki/Thermocouple

From the above link if you can reverse the effects or its causative factors you can minimize this effect.

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