Damaging to leave an amp on when not in use?

Discussion in 'Amps & Cabs' started by living room rocker, Jun 26, 2019.

  1. donepearce

    donepearce Well-Known Member

    Joined:
    Dec 12, 2012
    Messages:
    3,626
    Likes Received:
    3,170
    Location:
    London, helping a friend design a knitting machine
    I've gone into that. Moving metal against friction uses energy. No problem with that. I was being specific - producing voltage without current doesn't involve energy.
     
  2. El Mike

    El Mike New Member

    Joined:
    Mar 11, 2019
    Messages:
    13
    Likes Received:
    7
    That was a waste of energy.
     
  3. donepearce

    donepearce Well-Known Member

    Joined:
    Dec 12, 2012
    Messages:
    3,626
    Likes Received:
    3,170
    Location:
    London, helping a friend design a knitting machine
    Always helpful to get the measure of someones manners early on.
     
    Layne Matz likes this.
  4. Bill Moore

    Bill Moore Member

    Joined:
    Dec 7, 2018
    Messages:
    42
    Likes Received:
    26
    So how is this voltage produced without some form of energy? Even a battery relies on energy of the cell to produce voltage. Some energy has to be expended to create a voltage, whether it's muscles turning a crank, or burning gas in a turbine, or the sun shining on a PV cell. Some energy is always being used to make voltage available when the OP wants to turn on his amp.
    (I recall this was taught in Jr High science class here.)
     
  5. donepearce

    donepearce Well-Known Member

    Joined:
    Dec 12, 2012
    Messages:
    3,626
    Likes Received:
    3,170
    Location:
    London, helping a friend design a knitting machine
    Sorry, but no. Voltage alone requires no energy, and contains no energy.
     
  6. cerebral gasket

    cerebral gasket Well-Known Member

    Joined:
    Jan 13, 2017
    Messages:
    2,636
    Likes Received:
    3,365
    0 Volts = no energy
     
  7. donepearce

    donepearce Well-Known Member

    Joined:
    Dec 12, 2012
    Messages:
    3,626
    Likes Received:
    3,170
    Location:
    London, helping a friend design a knitting machine
    1,000,000 volts = no energy
     
  8. cerebral gasket

    cerebral gasket Well-Known Member

    Joined:
    Jan 13, 2017
    Messages:
    2,636
    Likes Received:
    3,365
    Bill Moore likes this.
  9. donepearce

    donepearce Well-Known Member

    Joined:
    Dec 12, 2012
    Messages:
    3,626
    Likes Received:
    3,170
    Location:
    London, helping a friend design a knitting machine
    That isn't basic. The voltages there are stored in reservoirs, equivalent to capacitors. There's plenty of energy there - a half C * V squared.
     
    Layne Matz likes this.
  10. cerebral gasket

    cerebral gasket Well-Known Member

    Joined:
    Jan 13, 2017
    Messages:
    2,636
    Likes Received:
    3,365
    True.

    Voltage is a difference of potential. If there is no difference of potential, there is no current flow. Voltage can be present in a circuit, yet not have any current flow if said circuit is an open circuit.
     
    Last edited: Jul 1, 2019
    Bill Moore likes this.
  11. fos1

    fos1 Active Member

    Joined:
    Oct 31, 2018
    Messages:
    106
    Likes Received:
    66
    Where is that thermodynamics class when you need it?
     
  12. Westernrider

    Westernrider Active Member

    Joined:
    Apr 16, 2014
    Messages:
    304
    Likes Received:
    224
    Location:
    Mid South
    (1,000,000v)(0.0 a) = no energy
     
  13. Bill Moore

    Bill Moore Member

    Joined:
    Dec 7, 2018
    Messages:
    42
    Likes Received:
    26
    "Sorry, but no. Voltage alone requires no energy, and contains no energy."
    It must be exciting living in a dimension where voltages randomly exist with no energy generation!
     
  14. donepearce

    donepearce Well-Known Member

    Joined:
    Dec 12, 2012
    Messages:
    3,626
    Likes Received:
    3,170
    Location:
    London, helping a friend design a knitting machine
    It really is. You live there too.
     
  15. Bill Moore

    Bill Moore Member

    Joined:
    Dec 7, 2018
    Messages:
    42
    Likes Received:
    26
  16. donepearce

    donepearce Well-Known Member

    Joined:
    Dec 12, 2012
    Messages:
    3,626
    Likes Received:
    3,170
    Location:
    London, helping a friend design a knitting machine
    who said anything about randomly? the discussion was about energy Show me an equation linking voltage to energy (and nothing else) and I'll shut up.
     
  17. Bill Moore

    Bill Moore Member

    Joined:
    Dec 7, 2018
    Messages:
    42
    Likes Received:
    26
    The previous link!
    You said there was no energy lost in creating voltage without current flow. Something has to instigate the voltage! As previously stated whether cranking by hand, or power, or a chemical reaction in a battery, energy is used to create voltage!
    Would you please give an example of a voltage existing without being generated by some energy source?
     
  18. cerebral gasket

    cerebral gasket Well-Known Member

    Joined:
    Jan 13, 2017
    Messages:
    2,636
    Likes Received:
    3,365
    Voltage is an electrical potential difference between two places. There must be both voltage and current to transfer power (energy).

    Voltage is produced by:

    1. Friction
    2. Pressure
    3. Heat
    4. Light
    5. Chemical Action
    6. Magnetism
     
    Last edited: Jul 1, 2019
    Bill Moore likes this.
  19. donepearce

    donepearce Well-Known Member

    Joined:
    Dec 12, 2012
    Messages:
    3,626
    Likes Received:
    3,170
    Location:
    London, helping a friend design a knitting machine
    Long ago in this thread I agreed that in the real world of friction and capacitance energy was needed to produce voltage. That was dealt with. We moved on. But voltage itself implies zero energy. That is where we were.
     
  20. cerebral gasket

    cerebral gasket Well-Known Member

    Joined:
    Jan 13, 2017
    Messages:
    2,636
    Likes Received:
    3,365
    The terms “voltage” and “energy” seem to be what fueled this discussion that has escalated to a game of Pigeon Chess.
     
    Last edited: Jul 2, 2019

Share This Page

  1. This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register.
    By continuing to use this site, you are consenting to our use of cookies.
    Dismiss Notice