A-LevelPhysicsD.C. circuits9702/12 · May/June 2016 · Q321 Mark
The potential difference V across a filament lamp is slowly raised from zero to its normal operating value. Which graph represents the variation with V of the current I in the lamp?
This question uses a diagram from the original paper, which isn't shown here. Open the full paper from the past papers archive to see it.
Agraph showing current (I) vs potential difference (V) curve starting from (0,0), initially linear, then bending towards the V-axis (slope decreases).
Bgraph showing current (I) vs potential difference (V) curve starting from (0,0), initially linear, then bending towards the I-axis (slope increases).
Cgraph showing current (I) vs potential difference (V) curve that starts with a linear increase and then shows current becoming constant (horizontal line).
Dgraph showing current (I) at V=0 and then increasing linearly with V (straight line from a positive I-axis intercept).
✓ Correct answer
A: graph showing current (I) vs potential difference (V) curve starting from (0,0), initially linear, then bending towards the V-axis (slope decreases).
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