When an electric heater is switched ON,the current flowing throug it is plotted against time(t).Taking into account the variation of resistance with temperature ,draw a graph plz

Asked by vishakhachandan026 | 29th Mar, 2019, 02:15: PM

Expert Answer:

Iinitially the heater will consume large current because its temperature  will try to increase as the temperature difference with respect to surrounding is large once the temperature of surrounding reaches the temperature of heater then the temperature reaches its saturation value  then the current consumption will decrease. 
Resistance of the coil is directly proportional to resistivity and length and inversely proportional to area. And all these factor depends upon length so overall it will cancel out the temperature dependence function. 
Graph is attached 

Answered by Ankit K | 29th Mar, 2019, 10:30: PM

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