HomeScienceDiscover science

Why is the power line always sagging?

If you pay a little attention, you will realize that the power lines installed on the poles are always dimmed and never completely horizontal. Why is that?

  1. We can still survive after being struck by lightning, why?
  2. Why are there three plugs and three legs in the power plug?

The reason is because the power line is mass and attracted by the gravity of the Earth.

Why is the power line always sagging? Picture 1
Wires when installed on electric poles are always dimmed.(Photo: Wired.)

Because the electric wire has mass, gravity appears on it. Suppose we hang the ends of an electric wire into two points horizontally, then it is in equilibrium and has the sum of the forces on the wire to be equal to the vector. This means that the sum of forces at the ends of the wire must be equal to the magnitude of the gravitational force.

So with a small part of the wire, what will the force act on? Suppose we can isolate a small piece of wire near the middle position, where the power cord when installed on the dimple poles the most. Since this part of the wire is also in equilibrium, the total force vector acts on the piece of wire with the vector.

Why is the power line always sagging? Picture 2 3 forces act on the power cord.(Photo: Wired.)

The power line when installed must be affected by 3 forces. Gravity is directed downwards, this force depends on the value of the gravitational field and the amount of wire. The remaining two forces are the tension T of the rope pointing upwards to keep the power cord stationary, located in the tangent position to the wire deflection line.

We find that, in the three forces that the power line is affected, no force is directed upwards to balance the gravity downward so it must be dimmed.

Even if the electrician uncle has increased the tension of the power cord to reduce deflection, it will never be completely horizontal.

4 ★ | 1 Vote
gravity

You should read it

May be interested

  • How to delete LINE account?How to delete LINE account?
    suppose in case you don't want to use line anymore or want to delete the old account to create a new account. you are having trouble not knowing how to delete line account. please refer to the following article of network administrator.
  • Set up a separate power source for Windows 7 on Laptop?Set up a separate power source for Windows 7 on Laptop?
    if you are downloading a large packet of data and get up to sleep, it is likely that the download process is interrupted due to the intervention of customizations in power options. therefore, it is best to reset or create yourself a personal setting in the power options to activate each time you need it.
  • Top tips for playing classic LINE 98 to help you get high scoresTop tips for playing classic LINE 98 to help you get high scores
    here are all the best strategies and tips to help you play line 98 for as long as possible.
  • Instructions for changing Profile information on LINEInstructions for changing Profile information on LINE
    when creating an account on line, you must use your email address and phone number. some information will be left in public mode (public mode), other users can access and read this information. ideally, you should update (update) your profile information.
  • Line breaks in ExcelLine breaks in Excel
    when you adjust the line stretching on excel will help make the page layout more reasonable, look more professional.
  • How to choose Power Plan in Windows 10How to choose Power Plan in Windows 10
    a power plan is a collection of hardware and system settings that manage how computers use energy. this tutorial will show you how to choose a power plan to use by default in windows 10.
  • Summary of ways to turn off iPad powerSummary of ways to turn off iPad power
    powering off is generally a simple operation on mobile devices that anyone can do, and ipad is no exception.
  • Steps to add/remove 'Link State Power Management' from Power Options in Windows 10Steps to add/remove 'Link State Power Management' from Power Options in Windows 10
    link state power management is part of the pci express power management settings in power options that allows users to specify an active state power management (aspm) policy to use for capable links when the link is down.
  • Compare Microsoft Excel and Power BICompare Microsoft Excel and Power BI
    excel and power bi are two very popular tools. both offer a range of visualization and analysis tools to help you create dashboards and reports.
  • What is Low Power Mode on iPhone?What is Low Power Mode on iPhone?
    on the iphone, many times you see a message asking if you want to turn on low power mode when the phone battery drops below 20%. in the article below, i will explain more about the functionality of this low power mode.

Discover science