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Which is correct graph

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Asked by Prashant DIGHE 18th July 2019, 5:18 PM
Answered by Expert
Answer:
graph (1) is correct representation of incandescent lamp.
As current increases, temperature increases, hence resistance increases.
 
In graph(1), as curent increases , slope ΔV/ΔI keep on increasing, showing the variation of resistance
 
In graph(2), if we find ΔV/ΔI from the graph, it becomes zero as current increases,
which is not consistent to the resistance variation of incandescent lamp
 
graph(3) and graph(4) shows constant slope,
it means resistant does not change with increasing current (or increasing temperature ) which is not correct
Answered by Expert 18th July 2019, 10:38 PM
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