Explain why it is not possible for a filament light bulb to obey Ohm's law.
PHYSICS · Multi-part · CBSE · Physics · Current Electricity · Current Electricity
Problem
1. Explain why it is not possible for a filament light bulb to obey Ohm's law.
(1) Explain why it is not possible for a filament light bulb to obey Ohm's law.
(2) Sketch the electrical characteristic (the graph of *voltage* against *current*) for a filament light bulb.
(3) How does the resistance of a filament light bulb change as the current flowing through it increases?
(4) Suggest why the resistance varies in this way. Your answer should refer to the microscopic behaviour within the resistor.