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What does the volts mean in a 12V light globe?
I know in a battery or another source of EMF, its voltage means the amount of energy it will give each unit of charge. Eg. if a battery was 12V, each coloumb of charge would contain 12V of electric potential energy. But what about in this case?
Does it mean that only charges with 12 joules of energy can travel through this light globe/filament? Or does it mean it functions on maximum 12V of energy per charge and thus only that amount or less will flow through it and make it function?
Please answer in most simplest terms. Thanks in advance. Will give 10 points for best answer.
It means that the globe was designed to use 12 volts. It can actually higher or lower voltages (up to a point). The total power (wattage) would be proportional to square of the voltage if it were not for the fact that the resistance of the filament changes with temperature.
At higher voltages the filament achieves higher temperatures resulting in higher resistance somewhat offsetting the higher voltage.
This higher temperature will result in a shorter filament life. It will also result the globe emitting light with a different color composition, an effect that becomes important in photography.
Amazing EMF evidence from The Ancient Ramm Inn
