Why does the resistance of a filament lamp increases with current?

The resistance of a filament lamp increases as the potential difference increases because the filament becomes hot. The movement of electrons (which is what causes the current) makes the atoms inside the filament vibrate faster and this makes the filament heat up.

What happens to the resistance of a lamp when the current increases?

As you increase the current, the filament heats up and the resistance increases.

What happens to the resistance of the filament and the current through the filament?

The current through a filament lamp is not directly proportional to the potential difference. This is because the filament gets hot, which causes the resistance to increase. At high temperatures, the atoms in the filament vibrate more. The electrons in the current now collide more with the atoms.

Does the resistance of a light bulb change with current?

If you take a bulb and increase the voltage across it, the current increases too. An increase in current means the bulb gets hot—hot enough to glow. As the temperature increases, however, the resistance also increases.

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

In a filament bulb, the current does not increase as fast as the potential difference. The more energy that is put into the bulb, the harder it is for the current to flow – the resistance of the bulb increases.

How does the resistance of a filament lamp change as the potential difference increases?

Why does the resistance increase as the current increases?

The moving electrons can collide with the ions in the metal. This makes it more difficult for the current to flow, and causes resistance. The resistance of a long wire is greater than the resistance of a short wire because electrons collide with more ions as they pass through.

What effect will increasing the current through a filament bulb have on the graph?

What effect will increasing the current through a filament bulb have on the graph? It will curve because the temperature and resistance are rising.