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The V-I graph for a series combination and for a parallel combination of two resistors is as shown in the figure alongside. Which of the two A or B represents the parallel combination?

Question

The V-I graph for a series combination and for a parallel combination of two resistors is as shown in the figure alongside. Which of the two A or B represents the parallel combination? Give a reason for your answer.

The graph shows the relationship between voltage (V) and current (I) for two conductors A and B. Conductor B has higher resistance than conductor A, as its V–I graph has a steeper slope.

Short Answer

Solution

A represents the parallel combination. In a voltage–current graph, the slope is resistance; a parallel combination has a lower equivalent resistance than a series combination. The graph for A has the smaller slope.

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Chapter 4: Electricity and Magnetism - Frequently Asked Questions in Board Examination [Page 284]