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  1. mdjakhi
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    mdjakhi New EF Member

    Location:
    Canada
    Hi guys,
    How do you use ohms law on a circuit with 0 resistance? So, assume there is 10Amps and 0 Ohms on a circuit, how would you find the voltage? (E=IR?)

    Also assume you have a circuit with no resistance on it, where would be considered the return path? Like the potential difference I mean from hot to neutral.
     
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  2. dmxtothemax
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    dmxtothemax Regular EF Member

    Location:
    Australia
    because this is just a hypothetical question -
    no resisitance = no voltage !
     
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  3. David M
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    David M Beauty I've always missed with these eyes Electrician's Arms

    Location:
    Staffordshire
    There's no such thing as no resistance in an electrical circuit, much like there is no such thing as perpetual motion in mechanics.
     
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  4. Vortigern
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    Vortigern Electrician's Arms

    Location:
    England
    Business Name:
    F.H. Electrical
    Assuming it is a superconductor=0v
     
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  5. Marvo
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    Marvo GMES....You absolute beauty. YOU ROCK DUDE!!!! Staff Member

    Location:
    South Africa
    If the circuit has no resistance it's a perfect short circuit. This is only possible theoretically, not in the real world. With a zero resistance circuit the current flowing would in theory be infinite but in this case you'd need to look at the whole circuit including the source of the power, not just the final circuit that supplies the load because the internal resistance of the power source becomes the limiting element.
     
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  6. Des 56
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    Des 56 Trusted Advisor

    Location:
    Gliese 581C
    If you can hang on to this no resistance circuit,the world will rejoice at your feet
    The good and the great will bow down to you.untold riches will be bestowed upon you and your name will live long in the history books

    Somehow I fail to see that happening,probably a more accurate test meter may scupper this fantastic future
     
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  7. DPG
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    DPG Electrician's Arms

    Location:
    S Yorkshire
    In defence of the OP, it is a good question to ask. Hopefully the replies above have answered it! Daz
     
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  8. David M
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    David M Beauty I've always missed with these eyes Electrician's Arms

    Location:
    Staffordshire
    These type of questions get raised on many of the science forums I'm a member of.
    The problem is they often start with a premise that is not possible in the first place. So, yes I agree its a good question in that its quite easy to answer and understand. So long as its accepted that there is not always continuity between the hypothetical and actual reality.
     
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  9. telectrix
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    telectrix Scouser and Proud of It Trusted Advisor

    Location:
    cheshire/staffordshire
    Business Name:
    Telectrix
    if there were such a thing as zero resistance, my knees would allow me to get up off them in zero seconds, instead if the 2 minutes it takes now.
     
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  10. HandySparks
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    HandySparks Trusted Advisor

    Location:
    Hampshire
    Business Name:
    Neish Electrical Services
    That would be gravity, then. Get yourself a job as resident electrician on the moon; much easier.
     
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  11. telectrix
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    telectrix Scouser and Proud of It Trusted Advisor

    Location:
    cheshire/staffordshire
    Business Name:
    Telectrix
    if only:
     
  12. stummish
    Online

    stummish Active EF Member

    Location:
    leeds
    If you get 0 ohms on a circuit contact CERN immediately to collect a free Nobel prize! Surely 0 ohms would give you infinate amps, and any PD on the circuit will trip in an infinaltely short time. Divide by 0 and the universe will implode, the ultimate PD!
     
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  13. dmxtothemax
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    dmxtothemax Regular EF Member

    Location:
    Australia
    Ignoring for now weather it is or isn't possible in practice,
    I always thought that to have a voltage ( or potential difference )
    then you need current flowing between two points
    with a resistance between these points.
    this is what gives you potential difference or voltage
    Am I correct or not ?
    SO NO RESISTANCE CAN ONLY = NO VOLTAGE ?
     
  14. Richard Burns
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    Richard Burns Trusted Advisor

    Location:
    Cambridgeshire
    Business Name:
    Richard Burns
    Yes V=IR so if R is zero, V is zero.
    There can be no voltage drop over a zero resistance, therefore no potential difference.
    i.e. the two ends of the zero resistance conductor are at the same potential.
     
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  15. dmxtothemax
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    dmxtothemax Regular EF Member

    Location:
    Australia
    Nuff said !
    Time for a beer or two or three.
     
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