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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
Here you go:
Source #1
What is virtual height of antenna?
Since the ionosphere have different types of layers namely D,E and F layers. So when a pulse transmitted from transmitter it get deflected or we can say reflect by these different layers and reaches to the receiver.
Thus the path followed by the pulse is the Actual path.
The distance between the highest point of actual path and the earth surface is called Actual height.
When a short pulse of energy sent vertically upward and traveling with the speed of light would reach taking the same two rays travel time as does the actual pulse reflected from the ionospheric layers. that height is known as Virtual height of an antenna.
in order to answer the question you have to become the question which is impossible unless you are the question then you should know the answer to the question which would mean they is no point in asking the question
put (programmable unijunction
transistor)
he Programmable Unijunction Transistor
behaves much like a unijunction transist
or (UJT), but is "programmable" via
external resistors (that is, you can use
two resistors to set a PUT's peak
voltage). Note that the name is a bit of
a misnomer -- as a thyristor, it is a
four layer device, unlike a true unijuncti
on transistor which has but two layers.
Like other thyristors, a PUT looks much
like a junction transistor with a fourth
layer and therefore a total of three P-
N junctions. Meanwhile, a third terminal,
the gate (G), makes a PUT function like
a hybrid of transistor and diode:
PUT symbolPUT cross-section
PUTs are not often used in BEAM;
they're essentially special-purpose
devices in electronics, used for lightingcontrol, motor speed control and othervariable power applications. In combination with an SCR they can, though, makea mean solar engine.
In a pinch, you can build up something
much like a PUT from discrete transist
ors wired as a complementaryfeedback
Here, as soon as any current flows in
either transistor, this current becomes
base current for the other transistor,
and both transistors turn on hard. This
means you can only build up this circuit
using low-leakage transistors ('though
this should be the case with any decent-
quality modern transistor ).
What feature of the ask suggests that it's an AM signal?
Just the amplitude change, while the frequency and phase still remain
What is the equation for temperature coefficient of resistance?
R= R0 * [1 + rho( t2-t1 ) ]
so from this equation ,
rho= R-R0/[R0(t2-t1)]
where
rho- coefficient of resisivity
R-resistance at any time t
R0- resistance at 00C
t2-final temperature
t1-initial temperature
How can I determine the capacitance of an unknown capacitor?
There are several multimeters which allow you to find out the pF of a capacitor, at least paper and ceramic types. You may want to look up YouTube videos that show you how to use a multimeter to determine the capacitance.
Again, it is dependent on the capacitor we are talking about. Sometimes they are rated and have a data sheet, sometimes a test bench may be required to perform things.
How do you calculate resistance?
You need to use the formula E = IR + Ir
where: E is the e.m.f. of the power supply (the theoretical maximum voltage across the terminals when no current is flowing)
I is current
R is resistance of the circuit (load resistance)
and r is the internal resistance of the power supply.
Therefore, you can rearrange this formula to give r:
E = IR + Ir (Subtract IR)
E-IR=Ir (divide by I)
(E-IR)/I=r or r=(E-IR)/I
What causes electrons in an electric current to flow slowly in that circuit?
We don't normally think of electrons "flowing slowly" in a circuit. In general, electricity operates at the speed of light. It is circuit characteristics like conductivity and resistance that determine how much current will flow in a circuit when a given voltage is applied. We will discover that more conductivity will permit more current, and more resistance will limit current (for the same applied voltage).
It is possible that inductance and capacitance could be looked at as circuit characteristics that cause current to "flow slowly" in that there is a time difference between when voltage and current appear in a circuit. But we usually think of electricity as a phenomenon that works at the speed of light.
The answer that has been posted might confuse someone beginning an investigation of the way electricity works. But it is suggested that the basic models of electricity be considered and even reviewed to get a handle on the concept of electron flow. One idea that may be offered in closing is that when two ends (wires) of an electric circuit are connected to a voltage source, current will begin to flow. And when one electron "goes into" one end of the wire, one will "come out" of the other end. It is not the same electron. The electrons available to support current flow in the circuit will "shift over one place" to accommodate the current flow.
Alternative AnswerElectrons move within a conductor in a rapid, chaotic, haphazard, way. When a potential difference is applied across a conductor, the electrons continue to move in this chaotic way; however there is a drift towards one end of the conductor. So, electron 'flow' is very, v-e-r-y, slow (an electron moving within a flashlight bulb's filament is unlikely to move throughout the length of that filament within the lifetime of the battery!), although the effect is more-or-less instantaneous along the length of the conductor.
How does a half wave rectified sine wave sound like?
It's hard to define a sound, but here's a try: A half-wave rectified sine sounds harsh and whiney. Not as sharp and jagged as a square wave, but not nearly as pure and smooth as a sine. The key is to realize that the half-wave rectified sine is a sine plus a significant load of harmonics, and wherever there is a lot of harmonic energy, we call it "total harmonic distortion". So the bottom line is, anything that isn't a pure sine, you would say it sounds "distorted".
How depletion region become narrow?
In fabrication process low resistivity (ohm/cm) of material results to expansion of depletion region lower than high resistivity
Can 8 ohm speakers on a 4 ohm amp damage them?
Sorry, there is no amplifier with an output impedance of 4 ohm on the market. Scroll down to related links and look at "Interconnection of two audio units". Look for an amplifier and a loudspeaker.
Microwaves, also referred to as "micro-kilowaves", are electromagnetic waves with wavelengths longer than those of Terahertz (THz) wavelengths, but relatively short for radio waves. Microwaves have wavelengths approximately in the range of 30 cm (frequency = 1 GHz) to 1 mm (300 GHz). However, the boundaries between far infrared light, Terahertz radiation, microwaves, and ultra-high-frequency radio waves are fairly arbitrary and are used variously between different fields of study. The term microwave generally refers to "alternating current signals with frequencies between 300 MHz (3 x 108 Hz) and 300 GHz (3 x 1011 Hz)." This range of wavelengths has led many to question the naming convention used for microwaves. The existence of electromagnetic waves, of which microwaves are part of the frequency spectrum, was predicted by James Clerk Maxwell in 1864 from his Maxwell's equations. In 1888, Heinrich Hertz was the first to demonstrate the existence of electromagnetic waves by building an apparatus that produced and detected microwaves in the UHF region. The design necessarily used horse-and-buggy materials, including a horse trough, a wrought iron point spark, Leyden jars, and a length of zinc gutter whose parabolic cross-section worked as a reflection antenna. The microwave range includes ultra-high frequency (UHF) (0.3-3 GHz), super high frequency (SHF) (3-30 GHz), and extremely high frequency (EHF) (30-300 GHz) signals. Above 300 GHz, the absorption of electromagnetic radiation by Earth's atmosphere is so great that it is effectively opaque , until the atmosphere becomes transparent again in the so-called infrared and optical window frequency ranges.
Differentiate aluminum to alloy?
Aluminium is an element of one type of molecules but an alloy is a combination of more than one type of molecules like NiCd-nickel cadmium alloy etc
How would the shape of an electron shell affect the ability of the material to conduct electricity?
Basically, the Electron shells in an insulator are complete, they are not prone to accepting external electrons or donating any of theirs. As such they aren't waystations for electrons looking to move (conduct). There is a need to slip away from what's going on with individual atoms when looking at conductivity (which can be used to sort out insulators from conductors). When a whole bunch of atoms or molecules are put together, a number of other opportunities or places for electrons to exist are created. The valence band of a given atom is subordinated and another type of "valence band" is set up. This new valence band (we are assigning a new definition) does not have a given energy level (like it would for a given atom) but, rather, has a range of allowable energy levels. This is because the many different atoms and molecules when combined to make up whatever it is we are making provide other places (energy levels) in which electrons can hang out. (Let's give Fermi, Schrödinger, Bloch and Brillouin the day off to keep from running off the page.) We have our newly defined valence band as a range of energy levels which an electron can occupy. (These were not available in a single atom of the material.) In a conductor, the band of energies in which an electron must be to support current flow actually are so low that they overlap part of the valence band. That means electrons in the material can support conduction and play musical electrons. In an insulator, there is a gap between the valence band (that group of energy levels allowed by the material as a whole) and the conduction band. Electrons cannot support conduction because they cannot reach the higher energy bands necessary to support it.
How does the left hand rule apply alternating current generator?
your thumb will point to the diretion of the rotation...and you forefinger will point to the direction of the magnetic flux
AnswerFleming's Left-Hand Rule applies to motors when using 'conventional flow' and to generators when using 'electron flow'. So, assuming you are talking about electron flow, the thuMb indicates the direction of Motion of the conductor relative to the flux, the First finger indicates the direction of the magnetic Field (north to south), and the sEcond finger indicates the direction of the E.m.f. induced into the conductor. This applies whether the generator as an a.c. machine or a d.c. machine.
Maximum number of E1 circuits on a DS3 circuit?
There is no direct mapping of E1 to DS3. The only way to connect the two is using an MPLS network.
A DS3 is 45Mbps. An E1 is 2Mbps. The bandwidth of 22.5 E1's can traverse a DS3.
In order to directly connect an E1 as would a T1 to a DS3 you would need an E3
An E3 is 34 Mbps and 16 E1's could connect to it.
What is the modern day name for cathode ray tube?
The Cathode Ray Tube is called CRT, but I don't know of any "modern day" name. I know it was discovered by J.J. Thomson, who discovered electrons through the Cathode Ray Tube.
What is the power of a parallel circuit with a resistance of 1000 ohms and acurrent of 0.03 A?
The power will be the product of the square of the current and the resistance of the load. The fact that the circuit is a parallel circuit is irrelevant to this question.
P = I2R = 0.032 x 1000 =0.9 W
Design OF A fire fighting system for electrical control building?
we have to distinguish between firefighting and fire alarm system. fire fighting is mechanical work (either sprinkler system or Foam or CO2 or FM200) and there is fire alarm or detection system this is an electrical thing that includes ( detectors an fire alarm system) for electrical control building we use FM200.
What is an embedded controller?
Invention patented by Hubert Kuo and I-Ming Lin on March 17th, 2003. Abstract: An embedded control unit is installed in a notebook computer, so as to take the place of the programmable processor in many conventional notebook computers for controlling peripheral devices. The embedded control unit includes a plurality of peripheral controllers, so as to control the peripheral devices usually used by typical notebook computers. The peripheral controllers can be directly connected to the peripheral devices, according to the specifications for different types and/or brands of notebook computers. In addition, the peripheral controllers can achieve control of the peripheral devices according to the non-adjustable internal register settings. In this way, the control of the peripheral devices can be achieved without using firmware, thereby simplifying the notebook computer development process and reducing the development cost.
