Why do telephone wires hang higher in winter than in summer?

Why do telephone wires hang higher in winter than in summer?

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.

Do telephone wires sag in summer?

Since metals expand with a rise in temperature, therefore telephone wires sag in summers. The wires are intentionally left a bit loose otherwise in winters they would contract and break. Thermal expansion is the tendency of materials to expand when exposed to heat.

Why are telephone wires taut in winter and slag in summer?

During summer, due to the high temperature the expansion of wire occurs so it becomes slag but in the winter due to the cold temperature wires contracts and become taut. Hence, telephones wires are taut in summer and slag in summer.

Why do wires expand in summer?

The materials when exposed to heat, the molecules in the materials vibrate much causing one another to hit due to heat. This causes them to move wider apart. This process is called thermal expansion. The same process happens in the electric wire.

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 telephone wires often given a 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 do telephone wires and power cables hang lower on hot days and become tighter at night?

Why telephone wires are kept tight in summer?

Why is there a gap between telephone wires?

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. (c) The gaps are left between the successive rails for making space for their expansion when there is rise in temperature in summers.

Do telephone wires expand and contract in summer and winter?

Most telephone wires are one or more twisted pairs of copper wire,on which contraction is seen in winter and expansion in Summer. Originally Answered: Why do the electric cables sag during summers and stretch during winters?

Why do telephone wires sag in hot weather?

The reason that telephone wires sag on a hot day is because the heat makes the telephone wires expand and on a cold day they contract. hope that helps 🙂 Why is it advisable to allow telephone wires to sag between poles?

Why does copper wire sag in the summer?

From physics there is a coefficient of thermal expansion that describes how a conductor will change with a rise (or reduction) with temperature. The “sag” that you see in the summer is factored in as a part of the design. If this was not designed the Copper Wire would “snap” (break) in the Winter.

Why do power lines get shorter in winter?

In winter, the reverse happens. Cold temperatures cause the cables to shrink. If they are too tight, they could break. So in winter, many wires and lines must have their tensions reduced to offset this seasonal change in length. Wiki User ∙ 2011-06-10 18:53:58