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Why does a 0 watt bulb glow and how?

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Anonymous

12y ago
Updated: 8/20/2019

If you are classing a zero watt bulb as one that glows as does a neon bulb then it is not a zero watt bulb. A neon bulb has no filament between the electrodes When energized it glows because of the inert gas neon within the glass envelope. These type of bulbs do not use a wattage rating when sizing them for an application. These types of bulbs are used mostly in pilot light applications. The lamp takes a starting voltage of 60 -110 volts AC to ionize the gas and start the glow. Once started the lamp can maintain conductivity with a reduced voltage of 20 to 30 volts. Once this conductivity starts the current needs to be limited. The use of an external resistor in series with the lamp is what is used to control the current.

However, the neon bulb still pulls current and thus power, so it is not a 0 watt bulb. There is no such thing as a zero watt bulb. With no power, you cannot interact with anything.

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Wiki User

12y ago

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