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Closed Circuit

Discussion in 'Electronic Equipment' started by JA, Mar 12, 2007.

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  1. JA

    JA Guest


    My niece has a question on her homework, and we can't find an answer
    anywhere! She's only 10, so it should be a fairly simple question -if you
    know anything about circuits, which I don't!

    What is needed for a closed circuit?

    I appreciate any help!

  2. DaveM

    DaveM Guest

    If you're asking about electrical circuits, you need a complete loop from power
    source through a load and back to the power source. Below is a diagram of a
    closed loop circuit:

    Please view in a fixed-width font such as

    +--------/ ----------+
    | Switch |
    | |
    +-+-+ *****
    | | * *
    | | * *
    Battery | | ***** Lamp
    | | |
    +-+-+ |
    | |
    | |

    The loop is formed by the ability of the current from the battery to flow from
    its positive terminal through the closed switch, through the lamp (the lamp
    glows) and back to the negative terminal of the battery. Note that if the
    switch is opened, the loop is opened and no current can flow, and the lamp will
    not glow.

    If you're talking about closed circuit TV systems, that means that connections
    (the connections may be wired or wireless) from the camera goes only to the TV
    receivers that are connected to the camera. It's intended for security systems,
    etc., where the TV signals are not intended for broadcasting to the public; in
    other words, intended only for private use.

    Dave M
    MasonDG44 at comcast dot net (Just substitute the appropriate characters in the

    Life is like a roll of toilet paper; the closer to the end, the faster it goes.
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