A-LevelPhysicsD.C. circuitsOct/Nov 2014Paper 1 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.
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The correct answer is B. This question tests the candidate's understanding of d.c. circuits within the Physicssyllabus. The examiner's mark scheme requires...
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Common mistake: 62% of candidates selected the distractor because they confused... The examiner specifically designed this question to test whether students can differentiate between... To secure full marks, candidates must demonstrate...
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