Filament Lamp Resistance

Why does the resistance of a filament lamp change with temperature. This thin wire resists the flow of electrons. The filament of a light bulb is an extremely thin wire.

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Filament Lamp Resistance Des idées

Such a resistor is called an ohmic conductor.

Filament lamp resistance. This heats up when an electric current passes through it and produces light as a result. A filament lamp is a component that does not obey ohm s law. At high temperatures the atoms in the filament vibrate more. Resistance of the filament lamp increase with temperature.

A filament lamp is a common type of light bulb. This page shows a plot of current against voltage for a filament lamp. The resistance is constant. For example a 100 watt 120 volt lamp has a resistance of 144 ohms when lit but the cold resistance is much lower about 9 5 ohms.

The resistance of the filament is temperature dependent. From the i v graph the ratio v i increases as current increases. Inside a traditional filament lamp the thin. This is because the filament gets hot which causes the resistance to increase.

Let s say you have a 120 watt light bulb plugged into a wall socket. As the potential difference across a filament lamp increases the current increases and the energy dissipated as heat increases resulting in a higher temperature. The resistance of a lamp increases as its temperature increases. The current through a filament lamp is not directly proportional to the potential difference.

As the temperature increases resistance of the filament increases. You can calculate the resistance of the wire with the resistance equation. The cold resistance of tungsten filament lamps is about 1 15 the resistance when operating. This heat energy is enough to cause the filament to glow white hot producing light whereas the wires connecting the lamp to the battery which have much lower resistance hardly even get warm while conducting the.

When you look at a normal incandescent light bulb you can see this water analogy in action. The filament of the incandescent bulb is broken and the length of the filament becomes shorter the resistance becomes smaller the voltage at both ends of the lamp is constant and the actual power of the lamp becomes larger and the brightness becomes brighter. It contains a thin coil of wire called the filament. The concentrated resistance of a lamp s filament results in a relatively large amount of heat energy dissipated at that filament.

The plot is not a straight line.