Thermodynamics won’t allow anything to have an efficiency of 100% because some energy will be converted to heat. What about electric irons and pretty much any other heating equipment that has a working principle revolving around losing energy to heat
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Everything glows very slightly. The hotter something is the higher energy and frequency the light has. When things are cooler than red hot they still radiate some light, but it is too low energy too see.
An iron also sends heat in all directions and not just down.
The wires sending the electricity to the iron as well as the powerplant have some loss.
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