February/March 2026 Paper 12

2026 · 40 questions · 40 parts · 40 marks

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32Circuit Components I V CharacteristicsMedium1 mark
Which graph represents the variation with current of potential difference (p.d.) for a filament lamp?
four V against I graphs for a filament lamp, arranged as A top-left, B top-right, C bottom-left and D bottom-right. Graph A is a smooth curve through the origin, symmetric about the origin, steepest close to the origin and flattening at large positive and large negative current. Graph B is a smooth curve through the origin, symmetric about the origin, shallowest close to the origin and becoming steeper at large positive and large negative current. Graph C has the same steep-near-the-origin, flattening shape as A for positive current, but its negative-current branch is much steeper and curves off the bottom of the graph well before reaching as far as the positive branch does, so it is not symmetric. Graph D has the same shallow-near-the-origin, steepening shape as B for positive current, but its negative-current branch stays close to a shallow straight line instead of steepening to match, so it is not symmetric