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How does energy from flashlight batteries compare to the light and heat the flashlight gives off?
Wiki User
∙ 15y ago
This depends entirely on the efficiency of the lamp. Tungsten lamps tend to give off more heat than light, whereas LED technology give off more light than heat.
By the laws of thermodynamics the sum of the energy that comes out of the system must equal the sum of the energy that goes into the system.
So:
Energy in batteries = Total light energy produced + Total heat energy produced
The efficiency therefore becomes the ratio between produced light energy and heat energy.
Wiki User
∙ 15y ago
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