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How does Mobile phone work

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  A mobile phone is a part of our life.   But I'm sure you're curious minds have always been struck by such questions as how a mobile phone makes a call, and why there are different generations of mobile communications?   Let's explore the technology behind mobile communications. When you speak on your phone, your voice is picked up by your phone's microphone. The microphone turns your voice into a digital signal with the help of MEMS sensor and IC. The digital signal contains your voice in the form of zeros and ones. An antenna inside the phone receives these zeros and ones and transmits them in the form of electromagnetic waves.   Electromagnetic waves transmit the zeros and ones by altering the wave characteristics, such as the amplitude, frequency, phase, or combinations of these.   For example, in the case of frequency, zero and one are transmitted by using low and high frequencies respectively. So, if you could find a wa...
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سوئچ کے بطور بائپولر ٹرانسلیٹر THE BIPOLAR TRANSISTOR AS A SWITCH

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 THE BIPOLAR TRANSISTOR AS A SWITCH The major application area is switching applications.  When used as an electronic switch, a transistor normally is operated alternately in cutoff and saturation.  In part  (a), the transistor is cut off because the base-emitter junction is not forward biased. In this condition, there is ideally, open between collector and emitter.  In part  (b), the transistor is saturated because the base-emitter junction is forward biased and the base current is large enough to cause the collector current to reach its saturated value. In this condition, there is, ideally, a short between collector and emitter.  Actually, a voltage drop of a few tenths of a volt normally occurs. سوئچ کے بطور بائپولر ٹرانسلیٹر ایپلیکیشن کا اہم علاقہ ایپلی کیشنز کو تبدیل کرنا ہے۔ جب الیکٹرانک سوئچ کے طور پر استعمال ہوتا ہے تو ، عام طور پر ایک ٹرانجسٹر باری باری کٹ آف اور سنترپتی میں چلتا ہے۔ حصے میں (a) ، ٹرانجسٹر منقطع ہوگیا ہے کیونکہ بیس امیٹر ...
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Charge چارج

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  There are two types of  charge  1.      Positive  charge. 2.      Negative  charge .  The electron is the smallest particle that exhibits negative electrical charge.  When an excess of electrons exists in a material, there is a net negative electrical charge.  When a deficiency of electrons exists there is a net positive electrical charge.    The charge of an electron and that of a proton are equal in magnitude. Q symbolizes electrical charge. Static electricity is the presence of a net positive or negative charge in a material.   Everyone has experienced the effects of static electricity from time to time  For example, When attempting to touch a metal surface or another person or when the clothes in a dryer cling together.   Materials with charges of opposite polarity are attracted to each other and materials with charge of the same polarity are repelled There is force acting between char...
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