Why does the resistance of a filament lamp change with voltage?

Why does the resistance of a filament lamp change with voltage?

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 the lamp as the current through it increases?

A filament lamp is a common type of light bulb. This heats up when an electric current passes through it, and produces light as a result. The resistance of a lamp increases as the temperature of its filament increases. The current flowing through a filament lamp is not directly proportional to the voltage across it.

How does the resistance of a filament lamp change as the potential difference across it 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.

What factors might influence the resistance of the lamp filament?

There are 4 different factors which affect resistance:

• The type of material of which the resistor is made.
• The length of the resistor.
• The thickness of the resistor.
• The temperature of the conductor.

Why does resistance of tungsten increases with temperature?

The resistance of the tungsten element increases significantly and quickly when you first switch it on. This is due to the increase in temperature due to the current flowing through the filament. It is this initial surge of current, that causes the bulb to blow.

Why does the resistance of a lamp increase with temperature?

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. As the potential difference increases, the current no longer increases as much.

Why does the resistance of tungsten filament increase with temperature?

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. More energy is needed to push the current through the filament.

What is the effect of temperature on resistance of tungsten filament?

The resistance of the tungsten element increases significantly and quickly when you first switch it on. This is due to the increase in temperature due to the current flowing through the filament.

Why does resistance increase with temperature in bulb?

“As the temperature of the filament in the light bulb gets hotter, the resistance of it increases as well. This is because the electrons can not flow through it as easily, because the molecules of the filament are moving faster and more rapidly.

Why tungsten is used in electric lamp?

The metal tungsten is almost exclusively used for the filament of the electric lamp because it has a very high melting point due to which it does not melt even when it is heated to high temperatures due to the passage of electric current.