CBSE Class 10 Answered
how does the formula f joules law formed?
Asked by Somya Sharma | 10 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
I=Q/t
So Q=I x t---(i)
And from Ohm's law
V=IR--------(ii)
Putting Q=I x t and V=IR in (I),We get
W=I x t x Ix R
Work done
So Joules 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 | 10 Jun, 2013, 02:29: PM
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