Why are telephone wires slack?

Why do the telephone wires get slackened in summer and get tightened in winter? In summers due to excessive heat, the temperature of the wire increases and wires expand. Also, Young’s modulus decreases and hence wires slack down. In winter, the temperature of wires decrease and wires contract.

Why do telephone wires sag in the summer?

The telephone wires will sag in summer due to expansions. While putting up the wires between the pole care is taken care in winter they are kept light so that they may not sag too much. So telephone wires will sag in summer due to expansion while you do suspect because of because of because of sighing expansion.

Why are telephones wires taut in winter and sag in summer?

Why do telephone wires sag in summer and become tight during winters. Because the cores of overhead wires are made from copper. 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 are telephone wires not pulled tightly?

Explanation: Telephone wires are kept slightly get free when they are laid because heat. Heat makes metallic wire expand and cold makes the material shrink. Therefore, without a pull they could become too tight and break in winters or pull free from their anchors in summers .

Why is it important that telephone wires are a little longer than needed when hung from the pole?

To avoid congestion over poles.

Why is a little sag left in overhead telephone wires?

A fall in temperature of the surrounding environment will cause a reduction in the length of the overhead wires. An initial little sag helps to ensure that when this reduction in length occurs, the wires do not break, which would have happened if they were taut initially.

Why do telephone wires break in winter?

Solution: (a) Most telephone wires are made out of copper, which contracts with drop in temperature and hence breaks in winter if it becomes too tight between the poles.

Why are telegraph wires not fixed very tightly in winter?

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 are power cables left slack?

The lines are often heavily loaded because of increased power consumption, and the conductors, which are generally made of copper or aluminum, expand when heated. That expansion increases the slack between transmission line structures, causing them to sag.