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Electric Circuits, Resistance and Ohm's Law — Physics STD 10 — Question

ICSE BoardEnglish MediumSTD 10PhysicsElectric Circuits, Resistance and Ohm's Law2 Marks
Question
(a) Define the term potential. State its SI unit.
(b) The V-I graph for a series combination and for a parallel combination of two resistors is as shown in the figure. Which of the two A or B represents the parallel combination? Give a reason for your answer.
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Answer

(a) The amount of work done (energy spent) in moving a unit positive charge from infinity to a given point in an electric field is called electric potential. SI unit of electric potential is volt (V).
(b) The graph line A represents parallel combination. It is because, in parallel combination, the magnitude of resistance decreases and hence, the current in the circuit increases.

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