2 Electricity

F47%

Figure shows the $I$ - $V\,$ characteristic of a filament lamp.

Figure: The current in a filament lamp plotted against the potential difference across it

a.

Give the current in the lamp when the potential difference across it is 6.0 V. Use Figure.

[1]

b.

Calculate the resistance of the lamp when the potential difference across it is 6.0 V.

[2]

c.

Describe how the shape of the graph in Figure shows that the resistance of the lamp is not constant.

[2]