A nichrome heating element connected to a 220 V supply draws an initial current of 2.2 A which settles down after a few seconds to a steady value of 2.0 A.
Why the current decreased? please explain. you may use higher language
A nichrome heating element connected to a 220 V supply draws an initial current of 2.2 A which settles down after a few seconds to a steady value of 2.0 A.
Why the current decreased? please explain. you may use higher language
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Because after getting heated resistivity of nicrome wire is increased . You easily can calculate the resistance of the wire after knowing resistive cofficient of nicrome by applying R=R0*(1+alpha* t). Where t is temparature in kelvin scale. R0 is resistance at zero kelvin.
thank you.
Because the heating effects of current . Resistivity changes with temperature. The value of resistivity increases R=(resistivity)l/a