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    Fuse and circuits in series and parallel

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    A fuse is a device to protect a circuit from the effects of a large current. The fuse is a small strip of metal that burns through when the current exceeds a certain value, thus producing an open circuit. Should a fuse be connected in series or in parallel with the circuit it is intended to protect? Explain.

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    Solution Preview

    Let's see what happens when the fuse is in parallel to the device.

    In a parallel circuit, each branch "sees" the voltage source independently of the other branches. Even if the fuse blows, the current Id will continue to flow unimpeded. If ...

    Solution Summary

    Why fuses are connected the way they are in circuits? The solution explains what happens in the circuit if the fuse is connected in parallel or in series.