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Hello,
I have a question on bulbs in a DC-circuit. What is a relationship between
power dissipated in a bulb and brightness? I have seen some conceptual
exercises which seem to assume that brightness is directly proportional to
the power dissipated. I found a definition for îbrightnessî: it is called
luminance. Luminance is connected to the luminous intensity which is
directly proportional to radiant energy.
Radiant energy depends on temperature of a filament. For instance when two
similar bulbs are connected in series the net current is (approximately)
halved. The power dissipated in both bulbs is reduced by factor 1/4.