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

1995 Views

See similar Physics GCSE tutors

Related Physics GCSE answers

All answers ▸

A rollercoaster carriage of mass 100kg has 45kJ of Kinetic Energy at the lowest point of its ride. Ignoring air resistance and friction between the wheels and the tracks, what is the maximum height above this point it could reach? [Take g as 10m/s/s)


Why does lowering the control rods in a nuclear reactor reduce the amount of energy released each second from the nuclear fuel?


A balloon's volume is 0.002m^3 at room temperature (20°C). What volume will the balloon occupy when it is cooled to -5°C? Give your answer to 3 significant figures.


In 5V circuit has two 2 Ohm resistors in parallel, what is the current passing through each resistor?


We're here to help

contact us iconContact usWhatsapp logoMessage us on Whatsapptelephone icon+44 (0) 203 773 6020
Facebook logoInstagram logoLinkedIn logo

© MyTutorWeb Ltd 2013–2025

Terms & Conditions|Privacy Policy
Cookie Preferences