Fuse wire melts because it’s made special, like thinner tin-lead, jo high current aate hi garm hoke pigal jaati hai. Connecting wire mota copper ka hota hai, woh itni jaldi nahi melt karta. Physics book mein yeh thermal effect of current padha tha. Actually, mujhe laga yeh sirf book ki baat hai, par jab mere cycle ki dynamo wire ghis-ghis ke short-circuit hui thi, toh woh wire bhi garam hoke pighal gayi thi – fuse jaise hi.
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