CAIE A-Level Physics 9.3.4 Filament Lamp Resistance
Practise explaining how filament temperature makes lamp resistance rise with current, linking heating to its non-linear I-V characteristic.
- Syllabus
- 2028–2030
- Course
- Physics 9702
- Level
- AS
Exam points
- explain that a filament lamp’s resistance increases as current increases because its temperature rises
- link the non-linear I–V characteristic of a filament lamp to heating and changing resistance
9.3.4—That the resistance of a filament lamp increases question 1
The variation of current I with potential difference V for a filament lamp is shown in Fig. 5.1.
Fig. 5.1
The resistance of the filament lamp increases with potential difference.
Explain why the resistance varies in this way.
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