(HOT SCIENCE) fungsi dari magnet di ujung kabel listrik

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(HOT SCIENCE) fungsi dari magnet di ujung kabel listrik

angry..birds

26-10-2011 07:22

(HOT SCIENCE) fungsi dari magnet di ujung kabel listrik

berawal dari keisengan gw amatin kabel charger laptop
gw nulis ni thread

dijamin no repost.. gw riset sendiri
==================================

agan agan semua penasaran kenapa hampir setiap kabel listrik (kabel audio, kabel komputer juga) terdapat sebuah benjolan kecil di pangkal/ujungnya?

seperti ini

Spoiler for contoh:

atau ini

Spoiler for contoh:

jika agan iseng bongkar, ternyata itu isinya magnet (ferro-magnet)

seperti ini

Spoiler for magnet:

fungsinya ternyata untuk menangkal radiasi yang ditimbulkan oleh benda lain (inteferensi) .. jadi misalkan pada adapter laptop, fungsi magnet di ujung colokan adapter itu untuk "membuang" radiasi RF (radio frequency) yang ditangkap oleh si kabel

wikipedia

Quote:

Ferrite cores are used in electronic inductors, transformers, and electromagnets where the high electrical resistance of the ferrite leads to very low eddy current losses. They are commonly seen as a lump in a computer cable, called a ferrite bead, which helps to prevent high frequency electrical noise (radio frequency interference) from exiting or entering the equipment.

sumber lain

Quote:

Computers can generate electrical signals from any of their cables that interfere with other devices, such as a television set. For example, personal computers provide brilliant crisp images that require fast timing circuits. These circuits operate at rapid frequencies (from 30 to 130 megahertz)-- about the same as television broadcast signals. The high-frequency signals carried by the video cable radiate an electromagnetic field. The TV antenna receives the energy and the TV screen goes fuzzy: a herringbone pattern caused by electromagnetic interference (EMI).

In this case, the culprit is the video-circuitry-generated electromagnetic field radiating from the video cable. Slip a ferrite doughnut over the end of the computer cable and Whoosh! The ferrite draws in the interfering flux lines and disrupts the undesired high-frequency current that's clobbering the TV picture. The ferrite acts like a high-frequency resistor by dissipating the interference

bahasa gampangnya, magnet itu akan membuang radiasi RF yang dipancarkan oleh perangkat sekitar

radiasi RF sendiri dapat terlihat jika kita meletakan perangkat yang beradiasi di dekat televisi (layar TV paling rentan radiasi.. bila terkena radiasi RF, layar TV akan 'bergoyang' emoticon-Wink

tanpa magnet itu, kabel akan seperti antena, dengan mudah menangkap radiasi dari perangkat sekitar, tapi dengan magnet tersebut, radiasi dapat diredam

sekian tulisan gw.. semoga bermafaat
emoticon-I Love Kaskus

sumber
http://en.wikipedia.org/wiki/Ferrite_%28magnet%29
http://www.wonderquest.com/rf-stopper.htm
http://answers.yahoo.com/question/in...8203008AAKWiPQ

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