anonymous
  • anonymous
give an example of an energy conversion that produces an unwanted form of energy?
Physics
  • Stacey Warren - Expert brainly.com
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katieb
  • katieb
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stormfire1
  • stormfire1
An engine would be a good example. During the transfer from chemical energy to mechanical energy, a lot of heat is produced which for the most part is left unused & wasted.
anonymous
  • anonymous
For example,Electrical energy runs the Vaccum Cleaner.As Electrical energy is converted into Mechanical energy,Friction causes the production of unwanted Heat energy!
anonymous
  • anonymous
@stormfire1 I have to argue with your explanation. Obviously, combustion of a fuel is highly irreversible (\(\Delta S >> 0)\), but let's consider an internal combustion engine as a heat engine. We must realize that from the Second Law of Thermodynamics, to extract work from this heat engine, we must reject heat to the cold reservoir. Therefore, an internal combustion engine must convert the chemical energy in the fuel to thermal energy, and the exhaust must be at a higher temperature than the ambient. Therefore, we must waste some thermal energy in order to extract work from the thermal energy extracted from the fuel. We can see from the Carnot Heat engine (which is internally reversible) that the maximum efficiency we can achieve is\[\eta = 1 - {T_L \over T_H}\]The unused heat from the combustion process is not "technically" wasted, but instead necessary to extract work from the thermal energy. Heat here is not unusable, even if thermal energy is the least useful form of energy. I'd even argue that conversion from chemical energy to thermal energy makes the energy more usable and more accessible. Especially, if we consider that isooctane (gasoline) is hard to use in a fuel cell (if not impossible). I'll say that friction is the best example here. We convert mechanical energy (the most useful form of energy from a 2nd law point of view) to thermal energy but then fail to use it for anything. I cannot think of any device that captures frictional heat and converts it back into mechanical energy.

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stormfire1
  • stormfire1
@eashmore: I see your point. I agree that the heat energy is necessary in an internal combustion engine so maybe that wasn't the best example. However, most of the heat produced is left unused by the engine itself (~65-75%) so in my mind, it was unwanted excess energy. I stand corrected :)

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