Mell Why do telephone wires become tight in winter?
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 often given SAG?
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.
Why telephone wires sag in summer and straight in winter?
In summers, the surrounding temperature is very high. Due to this high temperature, the metallic telephone wires are heated up and thus expands in length. Due to this low temperature, the metallic telephone wires are cooled down and thus contracts in length. Due to this, they become straight.
Why do telephone wires in some countries snap on very cold nights?
Conversely, the cold causes contraction in many materials, making it seem as the wires shorten during cold spells. It all has to do with metal expanding and contracting due to the exterior temperature. Metal expands in the summer,and contracts in the winter.
Why do telephone wires in some countries not on very cold nights?
When a solid gets heat it expands and on cooling it contracts. Due to this electrical and telephone cables are strung out a little loose so that in winter, as cables contract due to cooling of atmosphere and snapping may occur, can be avoided.
Why are wires kept loose?
Telephone wires are kept slightly loose when they are laid because heat. Therefore, without a slack they could become too tight and break in winters or pull loose from their anchors in summers . This is the reason why wires are kept slightly loose when they are laid.
What difference would you see between telephone wires on a hot day and a cold day?
sag more due to the increase in temperature. Explanation: Telephone wires sag during hot temperatures due to expansion of the wire and taut during colder temperatures due to contraction. Therefore, sag of telephone wires are due to the increase in temperature.
Why do telephone wires sag in summer class 7?
The telephone wires will sag in summer due to expansions and will break in winter due to contraction. Therefore, while putting up the wires between the poles, care is taken that in summer they are kept slightly loose so that they may not break in winter due to contraction.
Do telephone wires sag in 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.