Electronics Engineering

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Substation is the place (in transmission of power with overhead/underground cable) where the voltage level may be increased or decreased. That voltage level is so high that any personnel on its own cannot check/handle it by meters physically. Also the load on the system is never constant so there are fluctuations (ups/downs) in all the parameters of the electricity, like voltage, current, power factor (reactive and active power), frequency etc. So to calculate/estimate those things continuously with the time we need to implement separate monitors for them. This also implies that if any unacceptable change is observed in the power system, it should be immediately solved and continuity of power should be kept. That is the reason we go for control panels in substation.

Now in control panels there are all the those things which are required for the measurement of voltage, current total power, frequency, power factor. These are measured at all time of the day. If any fault is observed in the measured readings, then it is cleared immediately, and if it is not able to clear it itself, then the personnel on the substation can clear it by switching off the certain power line through circuit breakers. CBs, relays, CTs, PTs, APFC all are incorporated in control panels.

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Silver has the best electrical conductivity of any metal. One assumes it's not as common as copper because it's much more expensive, in addition to being heavier and slightly less durable.

A popular sound sensor is called a microphone. There are various designs and technology used, but the principle is the same.

You need a diaphragm. This is any (generally thin and light) material that is suspended in air. The pressure waves in air, that we call sound, make the diaphragm move.

In a dynamic type microphone, a coil of fine wire is also attached to the diaphragm and is surrounded by a magnet.

As the coil moves, so it generates small amounts of electricity, which can then be amplified and manipulated how you want.

Two modern trends in digital electronics: smaller and faster.

Digital oscilloscopes tend to be more expensive than analogue ones, mainly due to a better accuracy with the digital versions. There are many places you can purchase oscilloscopes; including specialised shops, or even more general marketplaces such as Amazon and eBay. Prices range from ´£35 for a mini oscilloscope up to nearly ´£500 for a top-of-the-range one.

Very often in translations from German to English the term 'free wheeling diode' for 'Freilauf-Diode' is used. Generally the correct translation for this term would be 'recovery diode'. The usage of the term 'free wheeling' only will be correct in mechanical aspects, e.g. the rear wheel of a bicycle or the clutch of the transmission line of a car.

It depends on the Country, University and the Department you are apply to. Usually, Universities look at your Transcripts, GRE score, IELTS/TOEFL scores, Extra Curriculars, Research wok, Essays, Recommendations etc. for scholarship decisions.

The wattage must remain equal on the primary and secondary sides of a transformer. An example to the above statement with a 1000 watt step down transformer. To fine the watts (load) the formula is W = A x V. The primary side of the transformer has the capacity of 1000 W = 4.16 Amps x 240 Volts. The secondary side of the transformer has the capacity of 1000 W = 8.3 Amps x 120 Volts. Using the transformer to its maximum, without overloading it, the primary will be 4.16 amps at 240 volts and the secondary will be 8.33 at 120 volts. As you can see the wattage (load) remains constant only the voltages and current change.

• in bipolar transistors it is called the base
• in field effect transistors it is called the channel

A variable resistor usually has three terminals, one of which is connected to the 'wiper' by which means its resistance is measured.

By using all three terminals, we can control the potential difference in a circuit. When used in this way, we call the variable resistor a 'potentiometer'.

By using two of the three terminals, one of which must be connected to the variable wiper, we can control the current passing through circuit. When used in this way, we call the variable resistor a 'rheostat'.

silicon controlled rectifier is a 3 terminal 4 layer device which has 2 consecutive P N junctions here the three terminals called anode, cathode and gate gate controls the conduction of the scr but diode just conducts in forward bias and blocks in reverse bias

They do not get nearly as hot because they convert electricity to light much more efficiently. Most of the energy goes to light not hear. How this is done is pretty complicated though. Wikipedia LED if you want to know more.

cz forword baise

The state machine described in the previous section is a deterministic finite automaton, in which each state is unique. What would make a finite automaton nondeterministic is if each state was not. For the example, if the state machine allowed the input to have any letter as the second letter for the word "person" to transition to the next, then the next state would not be unique, making it a nondeterministic finite automaton.

There is a way to use capacitors to increase the voltage in an ac circuit. It increases it by about 50 %. It was used to increase the voltage going to motors. It is seldom used now that it is much easier to run a higher voltage line into a place of business. It does not work for Direct Current.

Radios, Televisions & Computers.

the highest energy level which an electron can occupy the valance band at 0k is called fermi energy level

In an integrated circuit, electronic components such as resistors, capacitors, diodes, and transistors are formed directly onto the surface of a silicon crystal. The process of manufacturing an integrated circuit will make more sense if one first understands some of the basics of how these components are formed.

Even before the first IC was developed, it was known that common electronic components could be made from silicon. The question was how to make them, and the connecting circuits, from the same piece of silicon? The solution was to alter, the chemical composition of tiny areas on the silicon crystal surface by adding other chemicals, called dopants. Some dopants bond with the silicon to produce regions where the dopant atoms have one electron they can give up. These are called N regions. Other dopants bond with the silicon to produce regions where the dopant atoms have room to take one electron. These are called P regions. When a P region touches an N region, the boundary between them is referred to . This boundary is only 0.000004 inches (0.0001 cm) wide, but is crucial to the operation of integrated circuit components.

4 as to represent 10 we require 4 bits

In a computer system, the motherboard holds all the other circuit boards. The video, sound, game ports, and all other daughter boards are attached to this important piece of hardware.

In order to decrease voltage without decreasing amperes you have to also decrease resistance.

Ohm's Law: Voltage = current times resistance

The purpose of 3 field crop rotation was to allow fields a chance to regain minerals in between periods of growing crops. Every time a crop is planted and harvested, minerals are lost from the soil. This is due to the plants taking them from the soil to aid their growth. To prevent the fields becoming infertile a 3 field crop rotation system can be used to help with this problem. By not using one field, or planting crops (such as clover) which return nutrients to the soil, it could maintain a good amount of crop produced each year without making the fields infertile.