Is a filament lamp a resistor?

Is a filament a resistor?

The filament in an incandescent bulb does not have a constant resistance. 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.

Is a tungsten filament a resistor?

A filament lamp or incandescent light bulb provides an excellent example of a non-Ohmic component. Its resistance is low for low potential differences and it rises as the voltage increases and the temperature of the filament rises.

Is a light bulb an ohmic resistor?

The resistor is ohmic at low voltages (potential differences), but becomes non-ohmic at high voltages. The high voltages create heat removing a resistor from its ohmic region. The light bulb is non-ohmic because the filament burns at high temperatures. LEDs are non-ohmic because they are semiconductors.

Is wire a resistor?

A wire in real life, unless it is a superconductor, is a resistor because it has a non-zero value of resistance. However, it has a considerably less resistance than most of the other components of the circuit, so one often ignores that in ordinary cases, but not in all.

Why does a filament lamp not obey Ohm’s law?

The filament lamp does not follow Ohm’s Law. Its resistance increases as the temperature of its filament increases. So the current flowing through a filament lamp is not directly proportional to the voltage across it.

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