Explain jouls heating law ?

1.	Explain jouls heating law ?
Answer» Joule\'s law\xa0states the amount of\xa0heat\xa0production in a conductor is : Directly proportional to the square of electric current flowing through it. Is directly proportional to the resistance of the conductor. Directly proportional to the time for which electric current flows through the conductor.\xa0Joule\'s law of heating\xa0states that when a current \'i\xa0\' passes through a conductor of resistance \'r\' for time \'t\' then the\xa0heat\xa0developed in the conductor is equal to the product of the square of the current, the resistance and time. H =\xa0i\xa02 rt.\xa0Electric arc and electric welding also work on the principle of\xa0heating\xa0effect of current. In some cases such as transformers and dynamos,\xa0Joule heating\xa0effect is undesirable. These devices are designed in such a way as to reduce the loss of energy due to\xa0heating.

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