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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
How do you check field-effect transistor using analoge multitester?
There is no simple way to test FETs with either analog or digital multimeters.
Bipolar transistors can be tested to see if their junctions are OK but they can also have failures that cannot be detected with a multimeter.
Why do you use resistors and capacitors in a circuit?
resistors and capacitors are used in order to create a path for the current , for the resistivity of the current , for the storage of the current.
AnswerResistors don't just 'resist' electric current, they create a predictable change in voltage (electric potential) from one side to the other, so they can be used to adjust the expected voltage level at each point in a circuit.
In an electric circuit with an unchanging current and voltage, capacitors simply store current and wait for something to change.
In the more common electronic case of a circuit with voltage fluctuations, each capacitor is effectively a high-pass filter -- it permits quickly-fluctuating voltages to pass through, but reduces or stops slowly-fluctuating voltages.
What are the requirements to become a scientist in general?
A PhD in your related field(s). and ==== ====
Can you as a student develop an application on a pbx?
Yes, as long as you are not violating pbx system copyrights that result to an illegal revision of certain pbx system.
Difference between expert system and conventional?
Expert systems are computerized tools designed to enhance the quality and availability of knowledge required by decision makers in a wide range of industries. They augment conventional programs such as databases, word processors, and spreadsheet analysis.
Expert systems differ from conventional applications software in the following ways:
o The expert system shell, or interpreter.
o The existence of a "knowledge base," or system of related concepts that enable the computer to approximate human judgment.
o The sophistication of the user interface.
While any conventional programming language can be used to build a knowledge base, the expert system shell simplifies the process of creating a knowledge base. It is the shell that actually processes the information entered by a user; relates it to the concepts contained in the knowledge base; and provides an assessment or solution for a particular problem.
The main purpose of the knowledge base is to provide the guts of the expert system--the connections between ideas, concepts, and statistical probabilities that allow the reasoning part of the system to perform an accurate evaluation of a potential problem. Knowledge bases are traditionally described as large systems of "if then" statements, but this description is misleading because knowledge bases may not contain definitive rules at all, but may contain only associative relationships among different concepts, statistical information about the probability of certain solutions, or simply large databases of facts that can be compared to one another based on simple conventions intrinsic to the expert system.
Foster-seely of FM demodulation?
Just like a diode demodulator extracts audio from the last IF stage in an AM radio, a Foster Seely or similar discriminator circuit extracts or demodulates audio from the last IF stage in a FM radio.
What can you replace for 2N3053 transistor?
NTE128 is a direct replacement according to NTE's website.
What is the rule to input of 5 output of 12.5?
There are an infinite number of possible rules:
f(x) = 2.5*x
f(x) = x2/2, f(x) = x3/10, f(x) = x4/50 etc
f(x) = x+7.5, f(x) = 2x+2.5, f(x) = 3x-2.5 etc
What is the main characteristics of chebyshev filter?
It minimizes the error between the idealized and the actual filter characteristics over the range of filter, but with the ripples in the passband.
Note:
Butterworth filter does not give the sufficiently good approximation across the complete passband in many cases. And the Taylor's series is often not suited to the way specifications are given to the filter.For the IIR filter, the Chebyshev error is minimized over the passband and a Taylor's series approximation at
is used to determine the stopband performance. This mixture of methods in the IIR case is called the Chebyshev filter
How do you create a laser beam?
A: By applying to a laser diode pulse of current enough energy to emit photons at a certain frequency.
What is series - parallel connection?
In series connection current will be same. in parrel connection voltage will be same and current wil be varying
What 4 colour bands represent a resistor with resistance of 270 k ohms and a tolerance of 5 percent?
red-violet-yellow-gold
Why current a fundamental quantity though it is flow of charge per unit time?
Ampere = Coloumb / second is the same as saying that Coloumb = Ampere x second. Any of the two electrical units can be derived from the other one.
Ampere is NOT a "fundamental quantity"; it is an SI base unit. The base units are not necessarily those that are somehow considered more "fundamental" than others; instead, the base units are those that can be measured with a great accuracy. In the case of current vs. charge, it seems that measuring a current can be done with greater accuracy than measuring a charge directly; therefore, the current is the base unit, and the current is derived. However, this doesn't make current any more "fundamental" than charge.
Write mathematical form of ohms law?
The mathematical form of Ohms law is I=V divided by R. I is current, V is voltage while R is the resistance.
What is difference between good and bad conductors?
Good Conductors, such as silver, copper or aluminium, allow electric current to flow along them, while bad conductors (also termed "good insulators!) such as glass or mica or air impede or prevent electric current flow.
Physically a good conductor is a material containing movable negative electric charges which are electrons or ositive electric charges termed holes. or in the form of ions, such as in the electrolyte of a battery. A proper design of a good electrical conductor takes into account the temperature that the conductor is able to endure without damage, as well as the quantity of current or electrical conductivity.Most familiar and affordable conductors are metallic because metals are elements or substances having one, two or three electrons in their valence shells and their atoms are arranged in a pattern of regular lattice structure called metallic bonding. The valence electrons are therefore free to move around the lattice of positively charged ions as a "sea of electrons".
A bad conductor or good insulator is composed of a material which lacks mobile charges. Hence it resists flow of electric current because its internal electrical charges do not flow freely. Rgat is because its "valence" band containing the highest energy electrons is full, and so a large energy gap separates this band from the next band above it. Such good insulators are thereby made use of in electrical and electronic circuitry specifically to separate electrical conductors without allowing current to pass through themselves.
But good insulators are also made use of as the dielectric of a capacitor that is capacitor consists of two good conductors called its plates separated by a non-conductive region comprising a bad conductor or insulator. Capacitors are extremely commonly used in electronic circuitry such as radio or television receivers. The bad conductor area of a capacitor is known as its dielectricwhich may be air or some material like mica. glass or ceramic. Above a particular electric field, known as the dielectric strength Eds, the dielectric in a capacitor becomes conductive. The voltage at which this occurs is called the capacitors' breakdown voltage that is basically the voltage above which the bad conductor can no longer stop direct current passing through it.
What are metalloids in transistor radios used for?
The metalloids is combined in transistor radios to make them of high quality.
Why is ce amplifiers preffered over cb amplifiers?
yes because efficiency and application specify is more improve
What is LED and its construction and working?
LED is an abbreviation for light-emitting diode. An LED consists of a chip of semiconducting material doped with impurities to create a p-n junction. As in other diodes, current flows easily from the p-side, or anode, to the n-side, or cathode, but not in the reverse direction. Charge-carriers - electrons and holes - flow into the junction from electrodes with different voltages. When an electron meets a hole, it falls into a lower energy level, and releases energy in the form of a photon.
For more information, see related links, below.
Why power remains the same in transformer from primary to secondary?
Because of the law of conservation of energy. Neglecting minor losses from imperfect efficiency, eddy losses, heating, etc., a transformer's output power is always the same as its input power. If the voltage, for instance, is stepped down by a factor of 10, then its current will be stepped up by a factor of 10. Since power is voltage times current, power is preserved.
In reality, looking at the big picture, there are no losses. Whatever is "apparently" lost is made up in heat and electromagnetic radiation. Power In minus Power "Lost" equals Power Out. Always.
The current of one bulb (two bulbs shorted) would be about1 three times the current of three bulbs.
1 I say "about" because resistance is a function of temperature, and running three times the current through one bulb will make that one bulb much hotter, increasing its resistance. It might also burn out the bulb.
A MICRO-phone is an extremely small phone used for communications between two individuals.
A: Some microphones are not extremely small but rather large!! the use is to provide a signal to an amplifier whereby the microphone pickup can be listen to.
What does OL indicate in a digital multimeter?
It usually stands for open loop, another way of saying there isn't continuity.
Original answer: it means OVER-LIMIT
beyond the limits of the meter to register, such as "infinity" on a resistance scale
Whats the main difference between small signal amplifier and large signal amplifier?
1.Small signal amplifier can be designed easily using s parameter while large signal amplifier not.
When a Resister is jumpered out what is the voltage across the resistor?
A Resistor [note spelling] when jumpered-out has a theoretical resistance of zero. The voltage across same is zero.
To "jumper-out" is presuming a wire across the resistor: Theoretically this "ideal" wire has zero resistance, however, in practice a "thin" copper wire of (say) 10mm length - e.g., about the length of a 1/8th-watt resistor - would have a resistance around the milliohm.
Depending on the current passing through a wire (per V=IR) the voltage might be nothing or a mega-volt, as a function of the current and cross-section of the wire.
However, anything over, say, a small number of amps through a real-world "thin" wire would cause the wire to act as a fuse and break, so, in the case of a thin wire (0.25 mm say) we're looking at near zero volts across the resistor/wire combination at say 0.01 Amps and tending the supplied voltage at, say, 10 amps.
If, on the other hand, the resistor is no longer in the circuit (literally "jumpered out") then the theoretical resistance of the "gap" where the resistor should be is infinity (real-world: The order of megaohms). The makes the voltage across same just about the voltage supplied to either side of said resistor as if it were not there, which will depend on the rest of the circuit.
