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a nichrome wi...

Question

a nichrome wire of resistivity 100 X 10 to the power -6 ohm meter of the same length and the same area of cross section are connected in series ,current is passed through them,why does the nichrome wire gets heated first?

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Solution

$H e a t e n e r g y i s g i v e n b y : H = I^{2} R t A s r e s i s \tan c e o f t h e n i c h r o m e w i r e i s l e s s, t h e r e f o r e c u r r e n t w i l l b e h i g h . A s h e a t i s d i r e c t l y p r o p o r t i o n a l t o t h e s q u a r e o f t h e c u r r e n t, t h e r e f o r e, w i r e g e t s h e a t e d u p f i r s t .$

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