Sketch a graoh of current against potential difference for a filament lamp and explain its shape.

(draw diagram on whiteboard) As the potential difference increases, the current increases, since V=IR (where V is the potential difference, I is the current and R is the resistance). Initially the current increases rapidly with potential difference but then increases more slowly. This is because as the current increases, the temperature of the filament increases, so the resistance of the filament increases, so the current increases with potential difference less rapidly.

TD
Answered by Tamanna D. Physics tutor

2279 Views

See similar Physics GCSE tutors

Related Physics GCSE answers

All answers ▸

In an isolated container contains 1kg of ice at 0 oC. 1kg of warm water (323K) is poured into the container. How much ice (in kgs) remains after the system returns to thermal equilibrium? (by the end of the process?)


A typical question is about energy transfer - Explain the process of convection and give an example of where we can find them


A cyclist travels along a straight flat road. Describe the condition required for the cyclist to continue traveling along the road at a constant speed. How does this condition change if the cyclist travels up a slope?


Why does voltage increase (for a constant current) if temperature increases?


We're here to help

contact us iconContact ustelephone icon+44 (0) 203 773 6020
Facebook logoInstagram logoLinkedIn logo

MyTutor is part of the IXL family of brands:

© 2025 by IXL Learning