Minggu, 13 November 2011

Relay


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Automotive-style miniature relay, dust cover is taken off
A relay is an electrically operated switch. Many relays use an electromagnet to operate a switching mechanism mechanically, but other operating principles are also used. Relays are used where it is necessary to control a circuit by a low-power signal (with complete electrical isolation between control and controlled circuits), or where several circuits must be controlled by one signal. The first relays were used in long distance telegraph circuits, repeating the signal coming in from one circuit and re-transmitting it to another. Relays were used extensively in telephone exchanges and early computers to perform logical operations.
A type of relay that can handle the high power required to directly control an electric motor is called a contactor. Solid-state relays control power circuits with no moving parts, instead using a semiconductor device to perform switching. Relays with calibrated operating characteristics and sometimes multiple operating coils are used to protect electrical circuits from overload or faults; in modern electric power systems these functions are performed by digital instruments still called "protective relays".


Selasa, 08 November 2011

E-mail

Surat elektronik[1] atau pos elektronik [2] (bahasa Inggris: email') adalah sarana kirim mengirim surat melalui jalur jaringan komputer (misalnya Internet).
Lima langkah dalam proses pengiriman e-mail
 

Selasa, 01 November 2011

Blog

Blog merupakan singkatan dari web log[1] adalah bentuk aplikasi web yang menyerupai tulisan-tulisan (yang dimuat sebagai posting) pada sebuah halaman web umum. Tulisan-tulisan ini seringkali dimuat dalam urut terbalik (isi terbaru dahulu baru kemudian diikuti isi yang lebih lama), meskipun tidak selamanya demikian. Situs web seperti ini biasanya dapat diakses oleh semua pengguna Internet sesuai dengan topik dan tujuan dari si pengguna blog tersebut

Minggu, 30 Oktober 2011

selamat datang

selamat datang di blog saya , saya masih belajar menggunakan blog ini. mohon bantuan teman-teman semua untuk membantu saya blogging.