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  What is a resistor?     Resistors are passive electrical components that limit electric current. Resistor is a passive electrical component. Its primary function is to limit the flow of electric current. To understand the function and working of resistors, let us consider an uniform hollow pipe with water flowing through it. If the two similar pipes are now joined with a narrow pipe relatedly having less diameter or cross-sectional area. Then the water current will be resisted by the pipe having less cross-sectional area. It means this particular section of pipe will act as a resistor for water current. Similarly, a resistor by limiting or reducing the flow of charge carrier, reduces the flow of electric current in a circuit. What is OHM’S Law? Voltage across a resistor is directly proportional to the current passing through it. V µ I or, V=R.I Where, R is a proportionality constant, it is called resistance of a resistor.   It means that if the current
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Basics of Satellite Communication. ....... Satellite Communication fundamentals........

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Let us start with a very basic question.   What is satellite ? Satellite is nothing but an object that moves around another large object. For example: - Moon moves around the earth and earth is comparatively larger than moon, hence moon is a satellite of earth. Now, next question which immediately comes I our mind, what is GSAT, INSAT satellite frequently in news. So, to answer this. We will discuss categories of satellites. Satellites can be divided into two categories. 1.      Natural satellites 2.      Artificial satellites like GSAT- 30 satellite and satellites of INSAT series. Now we will discuss the importance of satellite communication. 1.      Wide coverage i.e. very large area of earth is visible from satellites and ideally with the help of 3 geo-stationary satellites the most of the parts of the earth is visible except polar region. We can say that the combination of 3 satellites, with the ability to relay message from one to other could inter connect virtually al
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ANTENNE BASICS & VARIOUS TYPES OF ANTENNA

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 ANTENNE BASICS & VARIOUS TYPES OF ANTENNA      Hello friends welcome to HiTech BabaJi- Simply Read & Learn . Today we will discuss about Antenna Basics & Various Types of Antennas.       ANTENNA    is a device which converts electromagnetic radiations from space into electrical currents in conductors and electrical currents from conductors into electromagnetic radiations in space. So we can say an Antenna is a metallic structure or conductor or wire  that receives or transmits radio waves.       Antenna comes in different shapes and sizes from little one to really big one. Little one which can be found on your mobile phones and really big one which receives signals from satellites, about 36000 kms away from earth surface and from deep space also.     Antennas may be divided into various categories depending upon physical structure, frequency of operation and their applications. Some of the important types of Antennas are:         1. Wire Antenna           2. Aperture Anten
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Basics of Radio Wave Propagation || Electromagnetic Wave Propagation || SURFACE 🆚 SPACE 🆚 SKY WAVE Propagation

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Electromagnetic or Radio Wave Propagation: The electromagnetic radiated waves Travel through different paths to reach at the receiver antenna. The path taken by the wave to travel from the transmitter and to reach at the receiver antenna is known as wave propagation. The propagation of electromagnetic waves may be divided into the following categories: 1.          Ground Wave or Surface Wave Propagation 2.          Sky Wave Propagation  3.          Space Wave Propagation (Direct wave follow -Line of Sight propagation and indirect or reflected waves have two components: a)          Reflected From Ground b)          Reflected from Troposphere).   Ground Wave Propagation : A ground or surface wave travels along the surface of the earth. These waves are vertically polarized therefore a vertical antenna is useful  for these radio waves to transmit. If a horizontally polarized wave is propagated as a ground wave, due to conductivity of the earth the electric field componen
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