Increasing Current and Resistance in Filament Lamp: Understanding Electron Flow

How does the resistance of a filament lamp change as the current in the lamp increases?

Based on the data provided, what happens to the resistance of a filament lamp as the current flowing through it increases?

Answer:

The resistance of a filament lamp increases as the current in the lamp increases due to the temperature coefficient of resistance.

When the current in a filament lamp increases, the resistance of the lamp also increases. This phenomenon occurs due to the temperature coefficient of resistance.

As the current flows through the filament of the lamp, it heats up. The increase in temperature causes the atoms in the filament to vibrate more vigorously, which hinders the flow of electrons through the filament. This hindrance to the flow of electrons results in an increase in resistance in the filament lamp.

For instance, when the current is low, the filament has a lower temperature and therefore lower resistance. However, as the current passing through the filament increases, the temperature of the filament also increases, leading to a higher resistance in the lamp.

This relationship between current and resistance in a filament lamp is not linear but can be represented by a curved graph, showcasing the impact of increasing current on the resistance of the lamp.