Question

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.

Answer 1

By Ohm’s Law V = IR

⇒ \(R =\frac{V}I\) = 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_eq = R₁ + R₂ + R_{3+ ………….+ Rn.} 

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.