Live and neutral are the path for the current's journey, and earth is our guardian, a safe path to the ground if things go wrong. The fuse melts to break that journey when the current becomes too greedy, like during a short circuit. I learned this only after I caused a small fire in my kitchen shed, you see. I thought I was being *chatura* clever, tying the wires around a blown fuse to keep my old kettle working, but I only invited trouble.
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