Why do electrical overhead wires hang loosely instead of being stretched tightly?

Copper, which is a metal conducts heat and electricity, makes up electrical wires. They conduct heat and electricity because they contain additional electrons. When heat is applied, it provides energy to these additional electrons. This additional energy causes them to move out of the original shell, expanding their atom structure. The wire will expand due to the overall expansion of their shells. The opposite happens when metal is cool. This means that the atoms get less energy from the sun and go back to a stable state. As a result, they contract to their initial size or to a smaller one depending on the temperature. This phenomenon causes wires to expand and contract every day. If wires are not tightly held, they might snap due to the constant contraction.

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