Three V-I graphs are drawn individually for two resistors and their series combination. out of A, B, C which one represents the graph for series combination of the other two? Give reason for your answer.

By Ohm’s Law

⇒ = slope of V-I graph

Therefore, the slope of the V-I graph represents the effective resistance.

Now in series combination of the resistance all the resistances get summed up

+ ………….+ R_n.

Therefore, the series combination will have the maximum resistance than the other resistors.

Hence the line with maximum slope (line C) will give the series combination of the other two resistors.