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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 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.

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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 ...

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