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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 the dc average voltage is having negative value?
Voltage is synonymous with 'potential difference', and cannot have a positive or negative value (in the sense of charge). So what you are describing is 'potential', which can. So, for example, a battery whose positive terminal is earthed or grounded will indicate a negative potential if a voltmeter is connected between earth and its negative terminal.
Does a mercury thermometer provide info in an analog or digital way?
Analog way. Unless you have a digital thermometer
How do you derive expression for diffusion capacitance?
Diffusion capacitance is the capacitance due to transport of charge carriers between two terminals of a device, for example, the diffusion of carriers from anode to cathode in forward bias mode of a diode or from emitter to base (forward-biased junction in active region) for a transistor. In a semiconductor device with a current flowing through it (for example, an ongoing transport of charge by diffusion) at a particular moment there is necessarily some charge in the process of transit through the device. If the applied voltage changes to a different value and the current changes to a different value, a different amount of charge will be in transit in the new circumstances. The change in the amount of transiting charge divided by the change in the voltage causing it is the diffusion capacitance. The adjective "diffusion" is used because the original use of this term was for junction diodes, where the charge transport was via the diffusion mechanism. See Fick's laws of diffusion.
To implement this notion quantitatively, at a particular moment in time let the voltage across the device be . Now assume that the voltage changes with time slowly enough that at each moment the current is the same as the DC current that would flow at that voltage, say (the quasistatic approximation). Suppose further that the time to cross the device is the forward transit time . In this case the amount of charge in transit through the device at this particular moment, denoted , is given by.
Consequently, the corresponding diffusion capacitance:. is.
In the event the quasi-static approximation does not hold, that is, for very fast voltage changes occurring in times shorter than the transit time , the equations governing time-dependent transport in the device must be solved to find the charge in transit, for example the Boltzmann equation. That problem is a subject of continuing research under the topic of non-quasistatic effects.
What happens to zener current after the breakdown voltage is reached?
After breakdown voltage is reached in a zener diode the current increases drastically.
Why is modulation necessary in radiobroadcasting?
Modulation in radio broadcasting is important because it is necessary to adjust the carrier signal so that the information in the modulating signal can be broadcasted. You must have modulation in order to transmit thru a radio wave.
D-STATCOM (Distribution Static COMpensator) and its new controller system, that be able to both mitigate all types of faults and operate as a Distributed Generation (DG), when it supplies power to sensitive loads while the main utility source is disconnected (i.e. it is under islanded operating condition
What will be the PF if measured after capacitor bank?
Capacitors are used to improve an inductive load's power factor towards unity. The power factor before and after adding the capacitor bank depends entirely on the inductive/capacitive values involved.
What is needed to drive 8 ohm speakers from TV?
youre mpother was a hamster and your father smeltof elder berries
Why is BC547 better than SL100 transistor?
Bc100 is an npn transister. if we know vlsi/cmos u will come to know about npn & pnp configurations.
Why is it not suitable to use a soldering gun to solder modem electronics component?
Solder guns as a rule have wider tips than soldering irons/soldering pens.You might not be able to reach just the spot that you want to with a solder gun given the size of the components, and how tightly packed they are on a modern circuit board.
Many modern components, such as integrated circuits, will be damaged by the high heat levels produced by soldering guns.
What is an input or output of a continuosly variable signal within a designated range?
The input or output of a continuously variable signal within a designated range is a sampled data or a feedback system. This accepts limited analog signal and encodes.
What are the Advantages of MUX over DeMUX?
Multiplexing is the combination of several signals on one carrier or medium.
Demultiplexing is the extraction of each of the original signals.
You can't have just one or the other, they are both necessary in the communication process.
So the concept of one having an advantage over the other is senseless.
What happens when you decrease the current in an electromagnet?
When you decrease the current in an electromagnet, the magnetic field decreases.
What is the load rejection and load pick-up in the power generation?
Load rejection occurs when load is suddenly removed from the generator. The most obvious example of this is the breaker connecting the generator to the power grid opens. This results in a full load rejection.
Load pick up means the generator is supplying power to a given load. When a generator comes on line, it will pick up some load that might have been supplied by another generator.
What is the formula which defines the voltage drop across loads in a series circuit?
Ohm's Law says that the voltage drop is equal to the resistance of the loads times the current.
It is written as V = I x R
A linear potentiometer is a potentiometer that changes linearly with rotation of the knob. A 30% degree turn will change the resistance 30%. It's a direct relationship.
This is in contrast to log potentiometers, which change resistance logarithmically with turns in the knob.
What is the minimum value of a resistor with gray red blue and gold band?
Grey (9) Red (2) Blue (6) stands for 92 x 106, or 92 megohms. Gold stands for +/- 5%, so the minimum value would be 87.4 megohms.
When a diode is doped with either a pentavalent or a trivalent impurity its resistance will be?
it will increase
How is cast iron converted into steel?
Steel is iron mixed with carbon, the amount of carbon changes the specifications of the steel (strength, elasticity,...)
What is crest factor of online ups?
Crest factor is the ratio between the instantaneous peak current required by the load and the RMS current (RMS stands for Root Mean Square, which is a type of average). Most common electrical appliances exhibit a crest factor of 1.4 (1.4 is the ratio of the peak value of a sine wave to its RMS value). Computers and IT equipment with Power Factor Corrected power supplies exhibit a crest factor of 1.4. Personal computers and stackable hubs exhibit a crest factor of 2 to 3.
What will be the collector current of emitter base junction of a transister is reversed?
The question is poorly phrased and needs a grammatical cleanup.
If you mean to ask "what happens to the collector-emitter current of a transistor when the emitter-base junction is reverse biased" then the answer is that the transistor will turn off, and you will only see leakage current.
What is the total inductance of two inductors connected in series?
Inductance in series is the sum of the individual inductances.
