Physics (AS & A Level) · Oct / Nov 2024 · Paper 12 · Question 33

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?

1. AGraph A: I against V, curve starting at origin with decreasing gradient (concave down)
2. BGraph B: I against V, straight line through origin
3. CGraph C: I against V, curve starting high at V=0 and decreasing (concave up)
4. DGraph D: I against V, curve starting at origin with increasing gradient (concave up)

As printed in the paper