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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

Why are power lines more dangerous than the electricity wires in your home?

Higher voltage and effectively unlimited current.

  • house wiring is 120V to 240V
  • neighborhood distribution power lines are 1000V to 5000V
  • city and industrial distribution power lines are 20,000V to 50,000V
  • intercity high tension transmission power lines are 100,000V to 1,000,000V

What should be done with the used of copper chloride etching solutions?

Copper has high biotoxicity and cannot be removed adequately by sewage plants, so while it is common for electronics hobbyists to flush it down the drain this should be avoided (although the amount in used by hobbyists is probably minor).

I have read that adding aluminum foil to the solution prior to disposal will precipitate the metallic copper creating nontoxic aluminum chloride. Filter out the copper flakes and pour the remaining liquid down the drain.

How many registers are there in x86?

Considering "x86" ranging from 8086 up to 80486 (ok, Pentium too) 32-bit CPUs ,

there are 29 registers , as follows :

EAX, EBX, ECX, EDX, ESI, EDI, ESP, EBP, EIP, CS, DS, SS, ES, FS, GS, "Status(Flags)-Register" CR0, CR2, CR3, TR4, TR5, TR6, TR7 DR0, DR1, DR2, DR3, DR6, DR7

Alexandre Botao

http://www.botao.org

botao@unix.sh

What are the Applications of integrator?

integrator can be used to obtain a sine wave from a ramp or sawtooth signal....

Why are drawing pencils often hexagonal in shape?

Less wood used in manufacture, easier to sharpen, easier to keep an aligned grip (so you can move a "notch" one way as the lead wears down and maintain sharpness) and they won't roll away when set down.

How do alternator diodes work?

Diodes allow current to flow in one direction only thus changing the alternating current produced inside the "alternator", to direct current which is required by your car's electrical system.

Think of them as check valves for liquids.

Denis

Why do some regulators need a heatsink?

Most linear regulators absorb the amount of energy equal to (Vin-Vout)*I where Vin is the voltage into the regulator, Vout is the regulated output voltage, and I is the current flowing through the regulator. This energy is dissipated as heat. As to much heat will burn the device out, a heatsink is needed where the die of the device cannot adequately dissipate the waste heat into the atmosphere.

What are transistors?

Transistors are semiconductor devices which can be used as switches (to turn on and off an electrical signal or current path) and also as a signal amplifier in a circuit. There are two broad types of transistors BJT (Bipolar Junction Transistor) and FET (Field Effect Transistors).

- Neeraj Sharma

A transistor is a silicon device with 3 leads, emiter, collector, and base. It is used both as a fast switching device and for signal amplification. It is said to be "saturated" when maximum current is flowing and "cutoff" when no current is flowing from the emiter to the collector. It takes a difference of approx. .7 volts between the emiter and base to turn it "on".

Good switch but actually inferior in sound quality to its predicessor, the "Thermionic" or good ole vacuum tube. If you don't believe me, listen to a guitarist play through both a transistor and vacuum tube guitar amp. You will be quite amazed!!!

For signal amplification the input signal goes into the base and the amplified output signal is taken at the collector with the transistor operating, or biased, between cutoff and saturation. It would be normally biased in between cutoff and saturation for the signal to be "linear" or non distorted. The signal at the collector will be inverted (180 phase shift) with respect to the input signal.

There are other applications where the output is taken at the emiter where the signal is not inverted (in phase) with respect to the input signal. This configuration, generally, has no gain or has what is called "unity gain". Sometimes you see this when separate stages need to be impedance matched for maximum efficiency.

The transistor is first "biased" or configured for a specific amount of gain and the output signal is taken at the collector with a higher amplitude than the input at the base.

A transistor is a semiconductor device

used to amplify and switch electronic

signals and electrical power . It is

composed of semiconductor material

with at least three terminals for

connection to an external circuit. A

voltage or current applied to one pair

of the transistor's terminals changes

the current through another pair of

terminals. Because the controlled

(output) power can be higher than

the controlling (input) power, a

transistor can amplify a signal.

Today, some transistors are packaged

individually, but many more are found

embedded in integrated circuits .

The transistor is the fundamental

building block of modern electronic

devices, and is ubiquitous in modern

electronic systems. Following its

development in 1947 by John Bardeen ,

Walter Brattain , and William

Shockley, the transistor

revolutionized the field of electronics,

and paved the way for smaller and

cheaper radios, calculators, and

computers, among other things. The

transistor is on the list of IEEE

milestones in electronics, and the

inventors were jointly awarded the

1956 Nobel Prize in Physics for their

achievement.

How the work the ac in a 2001 qx4?

" AUTO" on your climate control activates Air Conditioning. Most efficient with recycled air option on.
"ECON" setting does not use A/C to cool, but only fan.

Where do electrons travel in a conductor when it is conducting electricity - inside or on the surface?

My answer to this question may seem strange-- If a teacher asked this question, the teacher or the texbook has it wrong. The correct answer depends on many things that are not asked here. An advanced and recent electromagnetic theory text might have the right answer. Generally, you can think of the electrons flowing throughout the conductor at DC and low frequencies. As the frequency increases, the flow restricts itself more and more to the surface. See the term "skin effect" for more information.

What is the functioning procedure of full wave rectifier by using SCRs?

"What is the functioning procedure of full wave rectifier by using SCRs?" "What is the functioning procedure of full wave rectifier by using SCRs?"

Why the starting torque of a dc series motor is high?

load is heavier so starting torque is required

Answer

Because the same current is passing through both the armature and field windings, the torque is proportional to the squareof the current. Since the starting current is alway high (no back emf), the torque will be very high indeed.

Why si is better than ge?

1.Bandgap is comparatively large hence suitable for low & high temp.

2.High melting point of si makes it stable over wide temp.

3.si is more freely available in nature.

4.leakage current less than ge.

What is the maximum current capacity of 4 sq mm copper wire?

I can say it is 29 Amps.But again it depends on the cable length.The more the cable length is the less the current carrying capacity will be.

What is the difference between multiplexer and demultiplexer?

A multiplexor is a device that takes two or more signals and encodes them on fewer (often, on one) wire. A demultiplexor is a device that reverse that process.

What is the forward voltage across diode based on its colors?

Diodes do not have color codes as far as I know. The "turn on" voltage is usually in the ballpark of .4 - .8 volts, and is dependent on the type of diode (germanium, etc.).

You may be referring to resistors. Look up in google resistor color code, and this should help you. There will be three colored lines, two are the resistance, the third is a scaling factor.

For example, if the first two colors match 82, and the third matches 3, the resistor is a 82 x 1000 = 8.2k ohm resistor.

There may also be a fourth color; this denotes the resistance tolerance (1, 2, 5, or 10 percent). If the tolerance is 10%, the above example may range from 8.2k + / 1 820 ohms.

Advantages of SMPS over linear power supply?

1.Efficiency is high compared to linear power suplies

2.ripple voltage is very low 20mv.

3.constant regulating voltage is the one of the advantage of smps.

Can you measure AC current on a power cord?

Not very easily. A clamp on amp meter has to go around only one of the circuit conductors. If the clamp on meter is used around the power cord the two wires in the cord have a cancellation effect and the meter will read zero. If you can separate the load's wires that plug into the cord and clamp around that wire you will get a load amperage reading.