A-LevelPhysicsD.C. circuits9702/12 · Oct/Nov 2014 · Q351 Mark

The combined resistance R_T of two resistors of resistances R₁ and R₂ connected in parallel is given by the formula shown. 1/R_T = 1/R₁ + 1/R₂ Which statement is used in the derivation of this formula?

AThe currents through the two resistors are equal.

BThe potential difference across each resistor is the same.

CThe supply current is split between the two resistors in the same ratio as the ratio of their resistances.

DThe total power dissipated is the sum of the powers dissipated in the two resistors separately.

✓ Correct answer

B: The potential difference across each resistor is the same.

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Topic: D.C. circuits, A-Level Physics (syllabus 9702). Multiple choice, 1 mark.
Source: A-Level Physics, Oct/Nov 2014 Paper 1 Variant 2, question 35.

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