Telephone and electric wires stretch (expand) when the weather is hotter. Conversely, in the winter they shrink. Without some slack, they could become too tight and break, or pull loose from their anchors.
Bofore the question can be answered, it needs to be properly rephrased.The question contains a grammar error that is all too frequent these days... non-agreement with the subject in number (singular or plural). We need to be more careful of such simple grammar slip-ups. Poor grammar betrays a lack of education and an imprecision of thought.Correction: Why are telephone wires left slack?This error is creeping into speech today...from even the news anchors... through the contraction of "is" following the word "there", e.g. "there's too many jobs being lost...".Correction: There are too many jobs being lost...
that acoustic signals could be transmitted in the form of electricity through wires.
Actually it doesn't. You could talk on the telephone all day and night without wires. You only need wires if you want anyone else to hear you when you speak, or if you want to hear what anyone else has to say. The telephone was invented a long time before radio. By the time radio was first invented, virtually every home in the US was wired to central telephone offices, and it was another long time after that before radio equipment could be made small enough and cheap enough to make radio-based telephoning practical. That only happened within the past 20 years or so ... less than 1/6th the length of time that the telephone has been around.
For a start, most telephone wires are insulated and carry little or no electricity so, apart from falling off and hurting themselves, they won't get hurt on telephone wires. Really, you should have asked about why birds don't get hurt on overhead electrical wires. The answer is fairly simple really - to get electrocuted from those wires you need to complete the circuit, in this case touch the ground, for the electricity to surge through the body. Birds only sit on the wire and do not touch the ground, so they can't be electrocuted.
The telephone fulfills the need to communicate.
Wires in outside environment are subject of weather conditions, particularly extreme heat and cold variations. Material which wires are made of contracts and expands depending on temperature and therefore a safe margin is needed, so after contraction wires wouldn't snap.
Telephone is needed for communication.No, you don't really need one, but it is very useful.
form_title= Telephone Home form_header= Install a home telephone. How many telephone lines do you need?*= {1, 2, 3, 4, 5, More than 5} Do you currently have home telephone service?*= () Yes () No Do you need to buy a new telephone?*= () Yes () No
Does a DSL connection need to go through my telephone company?
You could use a shoe box as the base, then use the same size cardboard to cover the hole. Then, you cut a circle out of cardboard as the dial(write numbers on it.) For the telephone parts, fold a half sheet of paper for both parts. If you want to make one that's not tacky, you're on your own.
i NEED TELEPHONE NO. OF SANT SINGH CHATWAL
Amazon does not have a telephone number that you can call. If you need help, they will email you. In your email, you can leave your telephone number and they will call you.