The term wasted energy like the sound energy from the hair dryer is wasted energy and thermal energy from using the phone for too long
So if we aren’t benefiting from this Wasted Energy
How this comply with the law of conservation of energy
Where does the sound energy go does it convert to other forms or it disappears
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If your home is too cold or is likely to be too cold soon then the hair dryer sound energy isn’t wasted, since most of it will be converted to heat within the building. Whenever a surface absorbs a sound and doesn’t echo it all back that means the energy was converted to heat.
It’s not really an issue with hair dryers, since the vast majority of the energy will come out as heat in the hot air that we want anyway.
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