if metals and alloys of high resistivity produce heat why cant insulator produce heat?

Asked by Vivek Menon | 26th Jun, 2013, 04:46: PM

Expert Answer:

Insulators can't conduct electricity because of very high resistance. Heat produced = I^2 R, and since no current flows through insulator, no heat is produced in an insulator. 
In the case of metals, since they can conduct electricity (despite being of high resistance in some cases), they can produce heat. 

Answered by  | 26th Jun, 2013, 06:33: PM

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