WI-FI (WIRELESS FIDELITY)

Wi-Fi (Wireless Fidelity) is a wireless networking technology that uses radio waves to provide network connectivity and Internet high speed level.Wi -Fi Alliance, an organization that has Wi-Fi trademark term, specifically defines Wi-Fi as part of the product WLAN (Wireless Local Area Network) based on the standards of the Institute of Electrical and Electronics Engineers (IEEE) 802.11. Wi-Fi is easy it also means the IEEE 802.11x.

Initially, Wi-Fi is used only in the 2.4GHz 802.11b standard, but Wi-Fi Alliance has expanded its use of the term Wi-Fi to any type of network or WLAN products based on 802.11 standards, including 802.11b, 802.11a. dual-band, and others.

Wi-Fi to work without using a physical connection between sender and receiver cables, but with the technology of Radio Frequency (RF), a frequency within the electromagnetic spectrum associated with radio waves. When RF is supplied to an antenna, the electromagnetic, will be made and entered into a corner of a wireless network called an Access Point (AP). The main task is to spread AP (broadcast) wireless signal is detected on the computer and 'entry' into it. To connect to the AP and join the wireless network, computers and devices must be equipped with wireless network adapters.

Wi-Fi is available at: video game consoles, home networks, PDAs, mobile phones, operating systems, and other types of electronic products. Product that has been tested using a Wi-Fi will be labeled Wi-Fi Certified by the Wi-Fi Alliance.

ELECTROMAGNETIC RADIATION

Electromagnetic radiation is a combination of electric and magnetic fields that oscillate and propagate through space and carrying energy from one place to another. Visible light is one form of electromagnetic radiation. Theoretical studies of electromagnetic radiation called elektrodinamic, sub-field of electromagnetism. Electromagnetic waves discovered by Heinrich Hertz. Electromagnetic waves including transverse wave.

Any electric charge which has acceleration emit electromagnetic radiation. Left wire (or conductor as an antenna) conducts alternating current, electromagnetic radiation transmitted at the same frequency electrical current. Depending on the situation, electromagnetic waves can be like a wave or as particles. As a wave, characterized by the velocity (speed of light), wavelength, and frequency.

When considered as particles, they are known as photons, and each has the energy associated with the frequency indicated by the Planck relation E = H.ν, where E is the photon energy, H is Planck's constant - 6626 × 10 -34 J • s - and ν is the frequency of the wave. Einstein then update the formula becomes Ephoton = hν.

Which includes an electromagnetic wave:

Wave and wavelength( λ) :radio waves 1 mm, 10,000 km, Infrared 0,001-1 mm ,visible light 400-720 nm ,ultra violet 10-400nm, X rays 0,01-10 nm ,gamma rays 0,0001-0,1 nm ,cosmic rays do not include electromagnetic waves; smaller wavelength of 0.0001 nm. Light with large wavelength, the radio waves and infrared, has a frequency and level of lower energy. Beam with a wavelength smaller, ultra violet, x-rays or Roentgen rays, and gamma rays, has a frequency and energy level higher.