Antenna gain explained ...

Antenna gain explained            This one stumps even some of the most advanced RF engineers, that is, the "gain" of an antenna. Even the law states that the "Effective Radiated Power (ERP) will not exceed..." and this is based on the...

Why Ocean Water is Salty?

         There is no salt in fresh rain-water. River water tastes fresh, sea water salty. Yet the oceans are fed by the rivers that flow into them. Then where does the salt in the sea come from?         ...

Why Boiling point is low in Mountain Top...

                   If you boil water over a camp fire on the sea shore, you have to heat it to two hundred and twelve degrees. But on a mountain top, water boils before it gets as hot as that. This is because, on low...

Why An Iron Ship Does Not Sink...???

                If you put a nail or a lump of iron in a vessel of water it sinks at once. A piece of wood of the same size floats. So, until fifty years or so ago, people thought all boats...

What Is Buoyant Force...???

What Is Buoyant Force?              Buoyant force is an upward force that fluids exerts on any object that is placed in them. The ability of fluids to exert this force is called buoyancy . What...

Soldering Basics ...

Outline This procedure covers the basic concepts for high quality soldering. Minimum Skill Level - Intermediate Recommended for technicians with skills in basic soldering and component rework, but may be inexperienced in general repair/rework procedures. Acceptability...

What Is Flux? Why it is used in soldering ???

                      In high-temperature metal joining processes (welding, brazing and soldering), the primary purpose of flux is to prevent oxidation of the base...

Advantages of HVDC over HVAC transmission ...

Advantages of HVDC over HVAC transmission (on photo: The valve hall of the HVDC system is where the power is made ready for transmission; by Siemens) AC as preferred option Despite alternating current being the dominant mode for electric power transmission, in a...

Why are DC high-voltage transmission lines replacing AC high-voltage transmission lines at some places ???

         With AC systems the peak voltage is 2^0.5 (1.4142) times the RMS (nominal) voltage.  At transmission voltages that additional .4142 x voltage makes the insulation systems much more critical, lengthening the insulator...

Why is electrical power transmitted at low frequencies and not at high frequencies?

GENERATION Power is generated from Synchronous machines (Alternators) which rotate at a particular speed called the synchronous speed given by Ns= 120f /P and the frequency is given by :f= P*N /120 Now to produce voltage at a high frequency , two things have to be...

Why do we hear a hissing noise while passing a high voltage line?

This is because of corona effect.When an alternating current is made to flow across conductor of the transmission line, then air surrounding the conductor (composed of ions) is subjected to di-electric stress. At low values of supply end voltage, nothing really occurs...