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

2162 Views

See similar Physics GCSE tutors

Related Physics GCSE answers

All answers ▸

Can you explain the difference between a real and a virtual image?


On a day with no wind, a large object is dropped from a tall building. The object experiences air resistance during its fall to the ground. State and explain, in terms of the forces acting, how the acceleration of the object varies during its fall.


How do I use equations of motion ('suvat') to find a missing quantity?


How are force and work related?


We're here to help

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

© MyTutorWeb Ltd 2013–2025

Terms & Conditions|Privacy Policy
Cookie Preferences