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Question

When the current in a conductor is doubled keeping other parameters constant, the heating effect of the current will become:


  1. is doubled

  2. becomes 3 times

  3. becomes 4 times

  4. is unaffected


Solution

The correct option is C

becomes 4 times


We know, Heat produced H = Work done W

Work done W = VQ = VIt

Heat produced HVIt

Potential difference V = IR

Heat produced HI2Rt

 as, H = I2Rt . 
H1 = I2Rt ,
H2  = (2I)2Rt
H2  = 4(I)2Rt
                = 4H1

If the current is doubled, the heating effect of a current through a conductor becomes 4 times the original.

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