A-LevelPhysicsD.C. circuitsFeb/Mar 2017Paper 1 Q371 Mark
A potential divider consists of two resistors of resistances R₁ and R₂ connected in series across a source of potential difference (p.d.) Vᵢₙ. The p.d. across R₁ is Vout. [Figure showing a potential divider circuit with Vᵢₙ across R₁ and R₂ in series, and Vout across R₁] Which changes to R₁ and to R₂ will increase the value of Vout?
AR₁: doubled, R₂: doubled
BR₁: doubled, R₂: halved
CR₁: halved, R₂: doubled
DR₁: halved, R₂: halved
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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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