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Confused by circuit. A to B and B to C implies A to C?

Discussion in 'General Electronics Discussion' started by seanspotatobusiness, Feb 14, 2017.

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  1. seanspotatobusiness


    Sep 11, 2012
    I made a simple circuit to take current from my dynamo to charge batteries and power lights in parallel. I'm having a problem that doesn't make any sense to me. For simple wires (semi-conductors) I would expect that if A and B are connected (<2 ohms) and B and C are connected (<2 ohms) then A must be connected to C. In my situation A does not register as connected to C according to my multimeter. I'm really confused as to how this could be.

    Edit: I made a brief video that is maybe not really necessary. It's still uploading at time of edit.

    Edit: I also made a schematic but I think the battery symbol is upside down.


    Last edited: Feb 14, 2017
  2. Bluejets


    Oct 5, 2014
    Try redrawing your diagram with a pen and paper.
    Your circuit references are meaningless.
    Also what voltage is the battery, what are the Leds, what voltage are they, ???
    Sorry, but your video is not much help either as all we can see is the back of your head and the rest is too far away to decipher.
    Simple wires are not semiconductors.
    Battery symbol is oriented correctly.
  3. seanspotatobusiness


    Sep 11, 2012
    I forgot to say that I disconnected the battery so the voltage of the battery doesn't really matter. It has three discharged NiCd cells and stands at ~3 V presently.

    The circuit references aren't meaningless; they show the points where I'm connecting the DMM to check for continuity.

    Filming a decent video that gets everything close up whilst I also moving a probe around and showing the bigger picture is a bit much beyond my cinematography skills.
  4. Bluejets


    Oct 5, 2014
    Well then, good luck.
  5. duke37


    Jan 9, 2011
    Videos here sometimes work and sometimes do not. I abhor them, they wiggle around and have bad sound. Use pictures and text.
    You need a resistor in series with the leds.

    If A connects to B and B connects to C, then there is a connection between A and C.
  6. davenn

    davenn Moderator

    Sep 5, 2009
    are not semiconductors

    then you have a wiring problem
    Again, show us a clear photo of your construction

    exactly ..... again .... check for a wiring problem
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