The graph shows how the current through a lamp filament varies with the potential difference across it.
Which statement explains the shape of this graph?
1 )
As the filament temperature rises, electrons can pass more easily through the filament.
2 )
It takes time for the filament to reach its working temperature.
3 )
The power output of the filament is proportional to the square of the current through it.
The resistance of the filament increases with a rise in temperature.
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