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A circuit may have been designed to run delicate gadgets which require only, say 1 amp. There may be others that support gadgets that require only, say 3 amps. And there may be circuits that support gadgets that require 13 amps. The respective circuits will work even with 13 amp fuse on all of them as long as someone knows that the current will not exceed the specified amounts. But the moment the current exceeds the amount that the circuit is not designed for, the 13 amp fuse will still pass the excess current through these devices and they will be damaged. So it is advisable to use the correct fuses for each circuit.

An analogy, suppose there is a household, where the father is a pro football linebacker whose breakfast consists of 12 eggs, 2 lbs of sausage, 12 slices of bread, 4 bowls of cereal, half a gallon of juice, half gallon of milk etc. In the same house is a high school student whose breakfast consists of 2 eggs, no sausage, 2 slices of bread, 1 cup of juice. Also in that house is an infant which gets 8oz of similac for breakfast. All these are set up on the table. When the mother says "come and get your breakfast", each person knows what he is supposed to consume (or the mother supervises) and so no problem. Suppose one day the mother has gone out and there is temporary help and she says "you can have what you want". The infant gets the dad's breakfast, the high school student gets the similac and the dad get the high school student's breakfast. Assume that they all somehow consume the breakfast served to them. The dad will not perform well on the field but will survive, so will the high school student (he will be tired and cranky), but the infant (because of the overload) will suffer a lot.

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Q: Why is it not a good idea to just fit a 13 amp fuse to all plugs?
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