Physics (AS & A Level) · May / June 2016 · Paper 12 · Question 32

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-V curve rising with decreasing gradient (concave down)
2. BGraph B: straight line through origin
3. CGraph C: curve decreasing from high I at low V
4. DGraph D: curve rising with increasing gradient (concave up)

As printed in the paper