Joule heating and resistance vs resistivity in heating elements example problem

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example problem of joule heating, specific heat, temperature change in heating elements with emphasis on resistivity vs total resistance.
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Can you explain for me . why the resistance was change but the current passing them both is 15 AMP . should we increase the voltage to keep the value of current is 15 (AMP) in both case ???. tks for your help

giaoconhuynh