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CBSE Class 7 Answered

In a circuit, a conductor offering low resistance will heat up more than a conductor offering high resistance. True or false? Give reasons.
Asked by Anchita Shetty | 22 Nov, 2014, 09:48: PM
answered-by-expert Expert Answer
It is true.
 
The answer for this question is related to a concept that you will encounter in higher grades.
This concept is Joule's law of heating.
 
According to this law, the heat produced in a conductor is given as
 
H = I2Rt
Here, I is the current through the conductor,
        R is the resistance of the conductor, and
        t is the time for which the current flows in the conductor.
 
A conductor having high resistance should heat up more ideally. However, the current in low resistance will be greater.
Also heat is given as square of the current, thereby indicating that the conductor with low resistance will heat up more.
Answered by Romal Bhansali | 24 Nov, 2014, 11:14: AM
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