Why are wires hang loosely?
Electric cables hang loosely during summer due to the expansion process and they contract during winter due to the contraction process. Explanation: Electric cables are the solids which exhibit the property of contraction and expansion.
Why are tight lines not used to carry high voltage?
Because they carry large quantities of electricity at a very high voltage, transmission lines are not covered by an insulating sheath. The air around them provides insulation. Therefore, it’s important that nothing come close enough to the lines to cause an electric arc.
Why are power lines hung with a bow in them instead of pulled tight?
When power lines are hung they are left with an amount of slack in them, called “sag” in the industry, because the lines expand and contract with heat in their environment as well as with the amount of load they are under. By hanging them sagging, instead of hanging them…
Why are telephone and electrical wire tied loosely?
the wires are made of aluminium which has a property of contracting during winter season. so to avoid breakage of these wires they are fixed loosely between two poles.
Why do electrical wires sag in the summer and hang tight in the winter?
Because the cores of overhead wires are made from copper. Metals expand with heat and contract with cold. The higher temperatures in summer make the copper expand – so the lines get slightly longer. In winter, the reverse happens – the lines contract and tighten up.
Why do electrical wires sag form loops in the summer?
This process is called thermal expansion. The same process happens in the electric wire. During summer, the heat makes the molecules move wider apart and hence it sags and during the winter follows the opposite process and gets contacted.