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General question regarding fuses

Discussion in 'General Electronics Discussion' started by Rajinder, Jun 28, 2017.

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  1. Rajinder

    Rajinder

    419
    7
    Jan 30, 2016
    Dear all,
    I have the following circuit

    'A' -----------------| Fuse 315mA |----------------- Battery Positive + (3V)


    ---------------------------------------------------------------- Battery Negative - (0V)

    The battery is 3V. If I short out from point 'A' (fuse side) to Battery Negative terminal, the fuse blows. Why does the fuse not blow if I short out both terminals of the battery i.e. Battery Positive to Battery Negative?

    Is it because the fuse is not in the circuit? Or is the rating of the fuse too high? Or the battery hasn't enough capacity to blow the fuse. Note : The battery is rated at 1800mAh
    Note: Point 'A' is used to supply power to various circuitry including a PIC microcontroller.

    I apologise that this may seem very simple to many but I can't understand why.

    Thanks in advance
    Raj
     
  2. BobK

    BobK

    7,660
    1,675
    Jan 5, 2010
    If you short the battery terminals, there is no current going through the fuse.

    Bob
     
    hevans1944, Electric-T and davenn like this.
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