Here’s Why A Small Cylindrical Thing Is Used At The End Of Your Laptop Charger!!!

We are presently living in a world where charging and eating are almost equal to each other. We can’t survive without them. Charger is the main component for any electronic device whether it may be a costly DSLR or a budget smartphone. Most of the chargers are straight forward i.e they do not have any bulges or bumps of the wire. But there are some chargers which have a blob at the connecting end of the cord. Mostly these chargers belong to laptops, printers, and digital cameras.

So have you ever wondered what is that cylindrical thing at the end of your laptop chargers?


Most of us think that it is useless but the people who are closely associated with the technology might know the importance of it.

Here is the importance of it:

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They are known as ferrite beads or ferrite chokes and contains Ferrite (semi-magnetic substance) made from rust (iron oxide) alloyed with other metals.

It is nothing but an inductor which is used to suppress/block high-frequency noise in electronic circuits.

The ferrite bead is a passive electronic device which helps to isolate a laptop from electromagnetic noise from the waves which are picked from the existing AC-DC converter or picked up by the wire. Although it is not useful in everyday usage it helps the laptop to pass FCC tests. They are small and least expensive type of interference filters to install on an electronic charging cable.

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In simple words, ferrite beads are used to protect the device from high voltage spikes and to prevent the device from deterioration.

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Here’s What Actually Happens When You Press ‘Refresh’ Button In Windows!!!

Microsoft Windows or simply Windows is an operating system which is developed, designed and sold by Microsoft. It is a graphical operating system. It dominates the world’s personal computer market with over 90% of market share overtaking its rival Mac OS. There have been different versions of Windows like Windows 98, XP, Vista, 7, 8  and most recent one is Windows 10. But one of the common options in all these is “Refresh” option which appears when you right-click the mouse.

Have you ever wondered – what really happens when you click on refresh?

Some non-techie people might think that it will improve your system performance or it will make your system run faster but this is absolutely wrong. When you hit the refresh button the memory of your system is reloaded with the up to date information. In simple words refresh will redraw everything present on the screen pixel by pixel and displays the latest data.Refresh option is not meant for speeding up the performance. Then the question arises when does refresh is useful?


Refresh is useful in the following cases:

  • When your data is not up to date.
  • When the desktop or other folders don’t display the files you created, moved, copied or deleted.
  • When the realigned icons or files on the desktop or other folders don’t show up.
  • When files created by 3rd party applications don’t show in the folder.
  • When the name of a file is changed but it doesn’t show the new name.
  • When you change any appearance settings. etc

In fact, by clicking the refresh button the system will take few extra microseconds to display the latest data and if you press it continuously the system will slow down a bit in order to read and write the cycles it has to perform inside the hard disk.

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We Bet You Don’t Know The Reason Why Keyboard’s ‘F’ And ‘J’ Keys Have Raised Ridges !!!

Did you ever look at the keyboard and thought why ‘J’ and ‘F’ keys have raised bumps on them?

Sometimes, the same is seen in case of ‘5’ key too. Don’t worry, it is not any kind of production defect, but in fact this is by design.


It is basically for ease of use!

For using this keyboard with ease, the keys have ridges, so that speed typing is possible, without having a look at the keyboard. These ridges help in positioning the fingers. They enable you to have a correct typing position and since the ridges are there on these 2 keys, the index fingers are placed on them.

Know the positioning

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If the left index finger is positioned on the ‘F’ Key and if the right index finger is positioned on ‘J’ key, then other 3 fingers of left hand can rest on ‘A’, ‘S’ and ‘D’ and others can rest on ‘colon key’, ‘L’ and ‘K’. Both the thumbs must rest on space bar.

These improvements came in after June E Botich filed a patent in the year 2002. After this, all the keyboards came in with the same arrangement.

Here’s Why Hard Disks & Pen Drives Have Less Space Than The Promised Space!!!

Pen drives, hard disks come under the category of USB flash drive. USB flash drive is also known as USB drive or USB stick. It is a data storage device with an integrated USB interface which includes flash memory. Presently, pen drives and external hard disks have been part of our life just like smartphones. But have you ever checked that the pen drives storage capacity is different to that of the promised space by the manufacturer?

Yes, the storage space differs for sure. For example, let us take a 8 GB pen drive and after plugging it to your computer, you can see that only 7.46 GB space is available.



Then where is the rest of 0.54 GB ?

Scratching your head and cursing the manufacturer? Well, there is a trick used by the manufacturer here. Let me  explain it clearly.

A simple of math involved in this. Generally, every one of us knows that computers work using number 2 as the base. According to this the memory management will be :

1 Kilo Byte (KB) = 1024 Bytes

1 Mega Byte (MB) = 1024 Kilo Bytes (KB)

1 Giga Byte (GB) = 1024 Mega Bytes (MB)

8 GB = 1024 * 8 = 8192 MB

But pen drive and hard disks manufacturers consider it as base 10. i.e

1 KiloByte (KB) = 1000 Bytes

1 Mega Byte (MB) = 1000 Kilo Bytes (KB)

1 Giga Byte (GB) = 1000 Mega Bytes (MB)

8 GB = 1000 * 8 = 8000 MB ( approximately equal to 7.81 GB)

and the rest of the memory (approximately 0.35GB ) is reserved for data sector and system files for better performance.

As the device memory capacity increases, we lose more amount of space. The table below shows some shocking figures.



Manufacturers are actually not cheating anyone in this whole drama. In fact, they mention this on the box of hard disks and pen drives. Take a close look at your hard disk boxes.

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8 Places for Thrifty Bookworms to Download Free E-Books


Looking for the next great book to sink your teeth into? Look no further.

As summer rolls on, you may find yourself with free time to catch up on reading. We have good news for you virtual bookworms — you can get in a good read without spending a dime.

Here’s a list of eight places where you can find a wealth of free (yes, free!) e-books.

1. Google eBookstore

Google eBookstore

In the free section of the Google eBookstore, you’ll find a ton of free books from a variety of genres. Look here for bestsellers, favorite classics and more. Books are available in several formats, and you can also check out ratings and reviews from other users.

2. Project Gutenberg

With a collection of more than 45,000 free e-books, Project Gutenberg is a volunteer effort to create and share e-books online. No registration or fee is required, and books are available in ePub, Kindle, HTML and simple text formats.

3. Open Library

Open Library

The Open Library has more than 1 million free e-books available. This library catalog is an open online project of Internet Archive, and allows users to contribute books. You can easily search by the title, author and subject.

4. Internet Archive

If you’re looking for out-of-print books in different languages and formats, check out this non-profit digital library. The Internet Archive is a great go-to if you want access to historical and academic books.

5. BookBoon


Searching for a particular educational textbook or business book? BookBoon may have what you’re looking for. The site offers more than 1,000 e-books, it’s easy to navigate and best of all, you don’t have to register to download them.


With more than 29,000 free e-books at your fingertips, you’re bound to find one that interests you here. You have the option to browse by most popular titles, recent reviews, authors, titles, genres, languages and more.

7. Free eBooks



From romance to mystery to drama, this website is a good source for all sorts of e-books. When you’re making a selection, you can go through reviews and ratings for each book. If you’re looking for a wide variety of books in various categories, check out this site.

8. LibriVox

Want to listen to books instead? LibriVox is home to thousands of free audio-books, including classics and out-of-print books.