cbse class 12 physics notes communication systems

cbse class 12 physics notes communication systems

cbse class 12 physics notes communication systems
As new topics have been added in the syllabus of class 12 physics Communication Systems, we can prepare ourselves from cbse class 12 physics notes on communication systems provided officially by the cbse board.The new added topics are:-

Internet

Invention of computers changed the working style of people in twentieth century. Its capability to tirelessly and sequentially do arithmetical and logical operations made the human life simpler and faster. Offices, universities, banks, schools etc. nothing remained unaffected by use of computers. This was not enough and before the end of twentieth century we succeeded in creating a global network of computers that provides ways to exchange information and to communicate among all computers connected to the network. This global network of computers is what we now call Internet (or simply net). Internet, in fact, is the short form of INTER-NETWORK which is the interconnected network of all worldwide servers.

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cbse class 12 physics notes communication systems

Mobile Telephony

As we look around, in markets, on trains and buses, people crossing streets, we can see many individuals talking on cell phones or mobile phones. Mobile phones have changed the way we live and communicate. With advancement of technology, look and utility of mobile phone has also undergone change. In latest mobile phones, along with making and receiving phone calls one can also:
• Store contact information
• Make task or to-do lists
• Keep track of appointments and set reminders
• Use the built-in calculator for simple math
• Send or receive e-mail
• Get information (news, entertainment, stock quotes) from the Internet
• Play games
• Listen radio/music and watch TV
• Send text messages
• Take photos and videos etc.
In a way, today’s mobile phone is a handy computer equipped with Internet. In ordinary landline phones, phone instruments are connected to a telephone exchange through electric wires, which in turn connect our phone calls to the other phones. However, wire connections limit the mobility of a landline phone. Mobile phone technology has successfully overcome this limitation. Mobile phone is a low power operated device (transmitter), which can wirelessly send and receive radio frequency signals. Before this, walkie-talkie was also a wireless system of communication. You must have seen a policeman talking on his wireless set. After completing one sentence, he says “Over” and then listens. This was because the same radio frequency is used for both sending and receiving the audio signal. However, in a mobile phone, the outgoing and incoming signals use different frequencies, so the two individuals can talk and listen at the same time.



Download free full cbse class 12 physics notes communication systems.Just click the link below

cbse class 12 physics notes communication systems

Global Positioning System

Since ages man has invented various instruments to assist him in navigation on earth. Magnetic compass is one of the oldest navigational instrument man has been using for many centuries for direction identification on earth’s surface. Global Positioning System (GPS) based devices are the latest navigation assistance devices used these days. GPS devices provide accurate real time location and much more information to its user for easier and comfortable navigation even through his or her local streets. A commonly available GPS device is shown in the figure. When fitted in a car, it shows speed of the car, time, longitude coordinates and map of near-by area.

Download free full cbse class 12 physics notes communication systems.Just click the link below

cbse class 12 physics notes communication systems

 

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