how does the formula f joules law formed?

Asked by Somya Sharma | 10th Jun, 2013, 11:31: AM

Expert Answer:

When an electric charge Q moves against a potential difference V,the amount of work done is given by

W=Q x V-----(I)

We also know that


So Q=I x t---(i)

And from Ohm's law


Putting Q=I x t and V=IR in (I),We get

W=I x t x Ix R

Work done

So Joule’s law of heating states that when a current ‘I' passes through a conductor of resistance ‘R’ for time ‘t’ then the heat developed in the conductor is equal to the product of the square of the current, the resistance and time.


Answered by  | 10th Jun, 2013, 02:29: PM

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