Conservation Of Light Bulbs During The 1800s

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Comparing to 2.2% of efficiency for incandescent light bulbs during the 1800s, today’s incandescent light bulbs are 5% efficient. 100% electrical energy in, 5% useful light energy out with 95% waste thermal energy out. In a light bulb, the energy is transformed from electrical energy to light and thermal energy. There are many examples of energy transformations around us, even when we listen to music from a Smartphone. The chemical energy stored in a battery of a Smartphone transforms to electrical energy that flows through the wires of the earphones, and then it is transformed into kinetic energy when the speakers inside the earphones vibrate. Then this kinetic energy is transformed into sound energy, which the ears detect. For the light bulb
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