The graph shows how the electric current through a 12 V filament bulb varies with the potential difference across the bulb.

(a) What is the meaning of the following terms?

electric current

potential difference

(2 marks)

-

(b) The resistance of the metal filament inside the bulb increases as the potential difference across the bulb increases.

Explain why.

(3 marks)

(c) Use data from the graph to calculate the rate at which the filament bulb transfers energy, when the potential difference across the bulb is 6 V.

Use the correct equation from the Physics Equations Sheet.

Show clearly how you work out your answer.

Rate of energy transfer = ................................. W
(2 marks)

How did you do? Click to view the Mark Scheme Answers

From Q5 P2 AQA June 2012 (Higher)