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Therory of energy?

  1. Apr 11, 2012 #1
    Therory of energy??

    Greetings,
    Is there a term or word to describe regarding energy output "an action which produces more energy than is used to prepare"

    I dont have any background in physics so this is most likely an easy question for you to answer. Let me know if you need more info regarding my question and thank you for your help.

    Philip
     
  2. jcsd
  3. Apr 11, 2012 #2

    Ryan_m_b

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    Re: Therory of energy??

    Welcome to the forums :smile:

    In chemistry the term exothermic reaction is used:
     
  4. Apr 11, 2012 #3
    Re: Therory of energy??

    One thing. It looks like the OP was asking the opposite.

    Something that releases more energy than was put in is, if I remember correctly, a Perpetual Motion Machine of the First Kind, which is impossible, in which case another input of energy must be present, perhaps from the chemicals present in the reaction releasing some of their energy.
     
  5. Apr 11, 2012 #4

    Pythagorean

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    Re: Therory of energy??

    In nuclear fusion, they use exothermic too. But they're still shooting for "breakeven"
     
  6. Apr 11, 2012 #5

    Pythagorean

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    Re: Therory of energy??

    Whovian, the energy doesn't come from nowhere, it's stores as potential energy in the particle bonds.
     
  7. Apr 11, 2012 #6
    Re: Therory of energy??

    In a certain sense, these nuclear reactions aren't "break even," cos there's still a net loss of usable energy. The energy source is the nuclear fusion. :biggrin:
     
  8. Apr 11, 2012 #7

    Pythagorean

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    Re: Therory of energy??

    it's an economic statement. Just like I get "free energy" by taking my bike up an elevator so I can coast down a hill. It's only free to me.
     
  9. Apr 11, 2012 #8

    russ_watters

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    Re: Therory of energy??

    Yes, context matters here. In thermodynamics, it could be perpetual motion/ a first law violation or it could just be a heat pump.
     
  10. Apr 11, 2012 #9

    Ryan_m_b

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    Thats not input though that's part of the system. The system has stored energy, X energy is then applied which liberates >X energy. For example, taking a match to a barrel of oil. The input is the match.
     
  11. Apr 12, 2012 #10

    haruspex

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    Re: Therory of energy??

    By analogy with exothermic, I suggest exenthalpic or exergonic. There do appear to be prior usages.
     
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