Why does the telegraph line sag in summer?

Why does the telegraph line sag in summer?

Solution: 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.

Why do telephone wires sag more 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.

Do electric cables sag in the summer?

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.

Why are electrical wires loose in summer?

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 the telephone wires which sag in summer become straight in winter?

In summers, the surrounding temperature is very high. In winters, the surrounding temperature is very low. Due to this low temperature, the metallic telephone wires are cooled down and thus contracts in length. Due to this, they become straight.

Why are the telephone or telegraph wires laid in summer kept slightly loose while in winter they are kept tight?

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

Why are electrical wires not hung tightly?

The reason is to minimize the tension in the wire. The wires expand when exposed to intense heat from sun and contract during cold weather. Stretching the wire and connecting to the poles will make the wires loosen up and tear easily. This might lead to an accident.

Why do wires often break in winter season?

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 electric transmission wires stretched tightly when they are laid in winter season?

Answer: the electric transmission lines are stretched tightly in winter due to the decrease in temperature where the wires contract and in summer the situation is opposite . The thermal expansion due to heat loosens and expands the wires..

Why do telephone wires sag in the summer?

When the telephone wires get warm in the summer, they expand slightly and get longer, causing them to sag. Why do telephone wires sag during summer? Because the copper wire at the heart of the wire expands slightly – making the wires longer. since they are fixed at both ends, the wires sag due to the slight increase in length.

What happens to electric wires in the winter?

In the winter temperatures are naturally lower than in the summer. Electric wires/cables expand as temperature rises. Length of these wires and calculated expansion is taken into account when they are installed. In summer the wires become warmer and so expand in both length and diameter.

Why do telephone wires shorten in the winter?

It is because the heat causes expansion in materials, i.e. bridges (That is why bridges and concrete highways have expansion joints, otherwise they would buckle and deform during the hot periods.) Conversely, the cold causes contraction in many materials, making it seem as the wires shorten during cold spells.

Why do electrical wires in the electric pole hang loosely?

You will usually see them hang down a little, but in winter, they can be noticeably straighter. If they were hung tightly in summer then they would be too tight when the weather got colder and could break. Originally Answered: Why are the wires in the electric pole kept loose?