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Electronics Engineering
Electronics Engineering is a branch of engineering that deals with practical applications of electronic components, devices, systems, or equipment. Electronics are devices that operate on low voltage sources, as in electron tubes, transistors, integrated circuits, and printed circuit boards and use electricity as part of its driving force.
24,372 Questions
Where can one find information about a digital circuit?
One can find information about a digital circuit on a number of different informational websites. One can find information on digital circuits on Wikipedia, HowStuffWorks, and Infoplease.
How do you work out the current in a circuit?
we can calculate the current in a commmon electrical circuit by this formulae i.e,I=V\R where i is the current flowing in the conductor, R is resistance , V is the voltage.. THE FORMULA IS CORRECT but the term conductor does not suffice an explanation since a conductor is low in resistance R= resistance not conduction.
What happens if i use a 12v Dc in a device that requires 9v DC And can it be repaired?
Not a good idea. It will raise the current that could burn out components. To repair you would need to determine what was burned out and how easy it would be to replace.
What are the names of the different kinds of circuits?
there are 2
Series circuits and parallel circuits
Further AnswerThere are, in fact, four categories of circuit: series, parallel, series-parallel, and complex. 'Complex' includes any circuit that's not one of the other three.Series and Parallel
Pure semiconductors are insulators at room temperature. Impurities must be added to imbalance the covalent bonds of the crystal structure to make them conduct. This process of adding impurities is called doping. Dopants are usually selected from the columns immediately left (P type dopants producing hole current carriers) and immediately right (N type dopants producing electron current carriers) of the column of semiconductors on the periodic table.
By varying the amount of dopant the resistivity of the semiconductor varies inversely.
By using opposite type dopants adjacent to each other a PN junction forms, which can be used to make diodes, transistors, etc.
By doping an area of the semiconductor, oxidizing the surface of that area and plating the oxide with metal a MOS capacitorcan be made.
Components are wired together to make a circuit by covering the chip with an insulator (typically an oxide or nitride), etching holes in the insulator to the component contacts, plating the chip with metal and etching away the metal where you don't want things connected.
Thus doping (and a few other process steps) allows you to create all electronic components except inductors (and those can either be connected externally or simulated with a circuit called a "gyrator" consisting of a capacitor and several opamps) needed to make monolithic ICs.
What is the relation between carrier frequency and modulating signal?
If the modulating system is AM (Amplitude Modulation) then the amplitude of the carrier wave changes with the amplitude of the modulation. On a specrum analyser that shows up as frequency sidebands. If the frequency of the carrier waves depends on the amplitude of the modulating signal that is called FM (frequency modulation). On a spectrum analyser that shows up as sidebands also.
What is the difference between analog and digital representation?
Digital signals are now replacing analog for television transmission worldwide. Digital signals use a stream of digital data (2 differing signal levels to carry binary data) instead of a continuously variable signal level. The biggest difference is that digital data is more resistance to corruption than its analog equivalent. It is this characteristic that means we see a clean signal rather than one with noise in the image as is the case with a poor analog signal.
Digital signals can also be compacted using a technique called data compression. Compression allows signals to take far less bandwidth than they would otherwise need and so more channels can be carried in a given bandwidth. This compression allows HD signals to be broadcast. Broadcasting of HD analog signals would prove challenging.
It is important to understand that digital does in itself not mean higher resolution. Digital SD signals are exactly the same resolution as their analog equivalent. The comparison cannot be made with HD as HD transmission is always digital.
Digital transmission also allows a variety of additional data to be carried within the same signal. Surround sound is one of the more common benefits of auxiliary data.
What are the advantages and disadvantages of a modular plc's?
Advantages
Publicly traded companies are able to raise funds and capital through the sale of its securities. This is the reason publicly traded corporations are important: prior to their existence, it was very difficult to obtain large amounts of capital for private enterprises.
The financial media and city analysts will be able to access additional information about the business.[clarification needed]
DisadvantagesPrivately held companies have several advantages over publicly traded companies. A privately held company has no requirement to publicly disclose much, if any financial information; such information could be useful to competitors. For example, publicly traded companies in the United States are required by the SEC to submit an annual Form 10-K containing a comprehensive detail of a company's performance. Privately held companies do not file form 10-Ks; they leak less information to competitors, and they tend to be under less pressure to meet quarterly projections for sales and profits.Publicly traded companies are also required to spend more for certified public accountants and other bureaucratic paperwork required of all publicly traded companies under government regulations. For example, the Sarbanes-Oxley Act in the United States does not apply to privately held companies. The money and income of the owners remains relatively unknown by the public
Theory of RC coupled Amplifier?
In a two stage RC coupled amlifier the rransistor are identical and a common power supply is used.
the output is provided to the first stage of the amplifier wher it is amplified and this output is uses as a input for the sexound stage this is amplified once again by the other transistor in the sexound stage and the final out put is obtain.
What do you gain from a seminar?
students must always attend seminars to enhance their knowledge and experiences that the program offers
To know about the advantages of TTL logic family, one should have a basic idea about RTL, DTL etc. Diode logic (DL) uses diodes to implement logical functions like AND and OR. But the disadvantage is that it can not perform NOT operation. As AND and OR are not complete functions by themselves, they can not perform several logic functions without NOT. Hence, there was a need for some device which can perform a NOT function as diodes can not. That device is a transistor. Then came the DTL which uses a transistor along with diodes. As a transistor can act as an inverter, NAND (NOT-AND) & NOR (NOT-OR) operations can be performed. But this logic uses several diodes which will slow down its operation. Due to the delay offered by them, the logic levels may sometimes change i. e. 0 t0 1 or 1 to 0. Then came TTL. This logic uses a multi emitter transistor, a transistor with many emitter terminals. As every emitter is nothing but a diode, this logic eliminates the use of all diodes. This is the major advantage. As transistor becomes ON and OFF much rapidly than a diode, switching time will be faster. TTL, or Transistor-transistor logic replaced resistor-transistor logic, and used much less power. The TTL family is very fast and reliable, and newer faster, less power-consuming, etc. types are always being developed. = In TTL (Transistor-Transistor Logic), think that the device using this technology is made from several transistors. Another advantage is that many more chips employ this technology.
Are the amps in a series circuit the same all the way around?
Yes, the current is the same at every point in a series circuit.
Operating point in the transistor means?
The operating point of a transistor is simply the point, or circuit condition, where it is biased.
With no signal present, the operating point sets the collector-emitter current, and the resulting voltages. Ideally, the operating point is chosen to be the midpoint of the linear region of operation, so as to minimize distortion and to maximize range.
Since transistors have varying gains (hFe), and since the gain is temperature dependent, the operating point is usually chosen to be a range that also maximizes stability and minimizes the variability of the individual transistor.
What do the clolour bands on a resistor mean?
color coding makes easy to find the resistance of a given resistor..
coding contains colors like
0--Black
1--Brown
2--Red
3--Orange
4--Yellow
5--Green
6--Blue
7--Violet
8--Grey
8--White
---easy way to remember [say]
BB-Roy of Great Britain has Very Good Wife
---How to calculate?--
Ans: now if color code is Red-red-green-gold then
resistance= 22x10^5 Ohm and tolerance is +-5%
It is sometimes not obvious whether a color coded component is a resistor, capacitor, or inductor, and this may be deduced by knowledge of its circuit function, physical shape or by measurement. Resistor values are always coded in ohms (symbol Ω), capacitors in picofarads (pF), and inductors in microhenries (µH).
One decade of the E12 series (there are twelve preferred values per decade of values) shown with their electronic color codes on resistors.
A 100 kΩ, 5% through-hole resistor.
A 0Ω resistor, marked with a single black band.
To distinguish left from right there is a gap between the C and D bands. * band A is first significant figure of component value (left side) * band B is the second significant figure * band C is the decimal multiplier * band D if present, indicates tolerance of value in percent (no color means 20%)
For example, a resistor with bands of yellow, violet, red, and gold will have first digit 4 (yellow in table below), second digit 7 (violet), followed by 2 (red) zeros: 4,700 ohms. Gold signifies that the tolerance is ±5%, so the real resistance could lie anywhere between 4,465 and 4,935 ohms.
Resistors manufactured for military use may also include a fifth band which indicates component failure rate (reliability); refer to MIL-HDBK-199 for further details.
Tight tolerance resistors may have three bands for significant figures rather than two, and/or an additional band indicating temperature coefficient, in units of ppm/K.
All coded components will have at least two value bands and a multiplier; other bands are optional (italicised below).
---by Daniel Luo I like League of Legends
The purpose of a laser iridotomy is to allow an equalization of pressure between the anterior (front) and posterior (back) chambers of the eye by making a hole in the superior peripheral iris
What is uplink frequency in gsm?
GSM 900:
Uplink frequency: 890 - 915 MHz
GSM 1800 :
Uplink frequency: 1710 - 1785 MHz
GSM 1900:
Uplink frequency: 1850 - 1910 MHz
What are the steps in making a robot?
According to the website in the related links below, the steps are:
- Choosing a Robotic Platform
- Making Sense of Actuators
- Understanding Micro-controllers
- Choosing a Motor Controller
- Controlling your Robot
- Using Sensors
- Getting the Right Tools
- Assembling a Robot
- Programming a Robot
Would Current flow evenly in a circuit?
no because the earth turns sideways. and i sleep on my side so it doesnt work :)
What are the examples of single and two phase system?
In its simplest form, a single-phase a.c. system comprises two conductors: a line ('hot') conductor and a neutral conductor. In North America, however, it is usual for a single-phase residential supply to have three conductors: the two 'hot' conductors are connected across opposite ends of a single-phase transformer winding, while the neutral conductor is connected to the centre (tap) of that winding. This provides a combination of 240 V and 120 V, and is known as a 'split phase' single-phase system.
A two-phase a.c. system is very rare, these days, and you are unlikely to come across one. It is an archaic system that has long since been replaced by the three-phase system. Essentially, this system was provided by an a.c. generator whose armature windings were physically displaced from each other by 90 degrees, thus providing two phase voltages that are 90 electrical degrees apart. Usually, a two-phase system was a three-wire system, providing two line conductors and a neutral. The resulting line voltage (measured between the two lines) would then be 1.42 times either of the phase voltages (measured between one of the lines and the neutral).
Connect one end of a piece of wire to a battery terminal and the other end to the other terminal. The ends of the wire become oppositely charged and the electrons in the wire flow along it towards the positive terminal. This causes the chemicals in the battery to change and eventually they will all be changed and the battery will be flat. It will then be unable to keep the ends of the wire oppositely charged and the current will stop.
Or you could connect the wire to the terminals of a generator. The laws of magnetism will cause the generator - when it's turned - to charge the ends of the wire oppositely and a current will flow. But only while the generator is turning, because as soon as the electrons move down the wire they neutralise the charge, which must be replaced to keep the current flowing.
What is the potential difference and current characteristics in a series and parallel circuit?
In a simple parallel circuit -- for example, two resistors in parallel with a voltage source -- the voltage across the terminals of each component is the same. The current, however, 'splits' in order to take the two separate paths. In this case, you would use Ohm's law to find the current through each branch. In other words:
I1=V/R1, I2=V/R2.
If you have a current source instead of a voltage source, you would use current division to calculate current:
I1=Isource*R2/(R1+R2), and I2=Isource*R1/(R1+R2).
This is all in contrast with a simple series circuit, in which the current is the same through each component but the voltage drops are different. In which case you would use Ohm's law or Voltage division to calculate the individual voltages, depending on the source.
What is an example of a series circuit?
Series circuits, I'm doing my junior cert science so this may be wrong, but I'm pretty sure an example would be Christmas lights.
If one blows they all are extinguished, because they share the one current of electricity.
Car lights are parallel circuits....
I can't think of another series one, but I hope I helped a bit.
What is the relationship between current and conductor crosssectional area?
Specific resistivity is directly proportional to area of cross section of the conductor and specific conductivity is the inverse of specific resistivity. So we can say , Specific conductivity is directly proportional to area of cross section of the conductor.
Basically if you know the Voltage supply and the power used by an appliance then you use the formula for power which is Power = Volts x Amps.
Rearrange so Amps (current) = Power / Volts
If power was 2400 Watts and Volts was 240 the Current would be 2400 / 240 = 10 Amps
