Two students perform the experiments on series and parallel combinations of two given resistors

Two students perform the experiments on series and parallel combinations of two given resistors R_{1} and R_{2} and the following V-I graphs.

Which of the graph(s) is/are correctly labelled in terms of the words series and parallel? Justify your answer.

In the first graph, slope of V-I graph is resistance. Since, in series combination, resistance is more than the resistance in parallel combination, therefore slope of V-I graph for series combination is more than the slope oiV-I graph for parallel combination. Hence, first graph is correctly labelled.
In the second graph, slope of I-V graph is 1/resistance. Hence, second graph is also correctly labelled.

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