0
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
In a dry cell the carbon rod releases electrons and becomes the positive or negative terminal?
In a dry cell, the carbon rod is the positive terminal, or anode.
Definition of a conducting forward biased silicon diode?
Forward biasing of diode means applying positive potential to anode and negative potential to cathode in this case these points are happen in silicon diode-
1> Depletion Width Reduces
2>Voltage across junction is fixed at 0.7 volt
3> diode behave like short circuit (low resistance up to 400 ohm.)
4> it rectify the applied A.C signal.
ANSWER: It does not have fix .7 volts it has however an exponential VI curve which engineering take for practical as being .6 to.8 volts being forward conducting the voltage chosen depends on the actual current flowing a rectifier may have .8 volts while a signal diode may have .5 volts depending on the current flow. The resistance is just VI drop the impedance is 26mv/i
What is Comparison of armature controlled and field controlled DC servo motor?
Difference between field controlled and armature controlled is that field control is open loop and armature current is closed loop.
Which wave is highest RMS value peakvalue being the same?
The wave with the maximum RMS value, in comparision with the peak value, is the square wave.
What is inside a wind turbine?
A wind turbine generates electricity by converting its kinetic energy into electric energy. The kinetic energy of the wind transfers to the turbine, and the kinetic energy of the turbine converts to electric energy as it spins within an electromagnetic field.
What is the function of a switch in a electric circuit?
A switch is a device which can be used to make or break a circuit.
If that circuit carries a voltage which would be dangerous to people or animals then the handle of the switch must be made of a good insulator and the rest of the switch must be well shielded to stop anyone - or anything else - from touching any live wires.
If you get a chance to visit a science museum ask them to show you a "knife switch". Another place to see one is the Physics Lab at your local college or high school. Once you have seen a knife switch you will understand exactly how a basic switch works. It's quite simple really
Why are transmission voltages in ac systems generally higher than those in dc systems?
The main advantage of using ac is that you can step up and step down the voltage by means of a transformer,since transformer works only with ac.
another thing is that if dc power is used for transmission,then the power loss associated with t will demand the use of transmission lines which are very thick(have a larger cross section)..for long distance transmission this may lead to the requirement of power lines with impractical dimensions.
How do you analyze the water content in the milk?
One way to calculate water content would be to take a sample of the matter in question, weigh it, evaporate off the water component, and then weigh it again. The difference in weight divided by the original weight would be the portion of it which was water, I believe.
As I understand, the method geotechnical engineers use involves a machine squeezing water out of a sample. I haven't the slightest clue how that method works, if I'm even correct on that bit. I do know that their measurements for water saturation are volumetric in nature. Degree of saturation is given:
Sw=Vw/Vv=Vw/Vt*[phi]=[theta]/[phi]
"RADAR" is an acronym for RAdio Detection And Ranging, which is a broadcast beam and receiver, used primarily to detect the objects (such as aircraft) which are at a distance that cannot be observed visually. It is one of the applications of microwaves. Radar is used along with advanced transponder technology in air traffic control. Smaller radar units have been used to measure the speed of cars and trucks on highways, using the Doppler effect (frequency shift for moving objects), although these have mostly been replaced with laser devices using the same principle.
Radar is based on the principle that the RF signal at a high frequency is reflected back by reflective objects, typically large objects made from metal, composites, or rubberized materials. The distance between the radar antenna and the target can be measured by the delay time (microseconds, millionths of a second) between the broadcast and detected return.
The reflected signal is known as a 'radio echo'. The time taken by the signal to travel one nautical mile is 6.18 micro seconds, so it requires 12.36 microseconds to reach and return from an object one nautical mile away. The formula to determine the distance of the object 'S' is S=T/12.34 where 'T' is the time taken for the transmission and reception of the signal.
---
Radar is an acronym for RAdio Detection and Ranging. It uses RF transmission (radio frequency) in the microwave band to detect and range any detectable target within its range. It is an "active sensor" which emits RF waves that bounce off a target and are detected when the wave is received back. The time delay between transmission and detection produces its range given that the RF wave propagates at a uniform speed.
Modern "stealth" aircraft use RF scattering, along with microwave-absorbing materials, to avoid detection by traditional radar. Some advanced planes have radar reflection signatures so low that they are less than those of small birds.
How step up transformer step up the input voltage?
It depends on the ratio of turns from primary to secondary.
What is half wave precision rectifier?
A device that converts full wave signal to half wave rectified dc signal. The device operates only for half of the input cycle during which the input signal is alllowed to pass and stops transmission of the signal for other half cycle. ok?
What is a semiconductor diode and their application?
It can be either a junction or point contact diode built with semiconductor material. there are many types depending on intended usage.
- junction diode is produced as described in its name by forming a junction in the semiconductor by using opposite types of dopant impurities.
- point contact diode is produced as described in its name by taking a semiconductor base and pressing a sharp metal point on its surface.
A few of the types of semiconductor diodes are: small signal, power rectifier, zener, tunnel, gunn, etc.
Why is the peak amplitude of voltage load lower than the amplitude of voltage transformer?
Unless otherwise stated, the value of an a.c. current or voltage is expressed in r.m.s. (root mean square) values which, for a sinusoidal waveform, is 0.707 times their peak value. The output of a voltage (or potential) transformer is no different, its measured voltage will be its r.m.s value which is lower than its peak value.
The current will drop. Y??
See it this way - resistance is something that opposes current flow. Voltage is the one that helps the current to get across the resistance. So if u have a high resistance, u need a high voltage to get the same current across.
But all the values are solely dependent on the output required.
Hope that helps.
Describe the relationship between voltage and current for the resistors?
R = V/I Therfore the resistance is proportional to the voltage and inversely proportional to the current.
What are signal conditioners used for?
Signal conditioners are used for a variety of purposes. They can be used as amplifiers, electrical isolators, exciters, and cold junction compensators.
Identify the characteristics of a digital System?
Knowledge
Digitization
Virtualization
Molecularization
Integration
Disentemedition
Convergence
Innovation
Presumption
Immediacy
Globalization
Discordance
What should be done with the unused inputs of a cmos integrated circuit?
tied high through a pullup resistor or grounded, never left open or they will pickup noise that may perturb other devices in the package that are used.
What arer the 3 legs of a transistor?
Emitter, Collector and Base
cutoff region, saturation region, and liner region
What happen if a light bulb burned out in a series circuit?
Physics
Believing that the universe can be explained with some finite amount of calculations and tables is a legitimate reason for sectioning under the Mental Health Act 2007.
Physics (either from the ancient Greek φύσις meaning "nature", or from Cockney rhyming slang "fizzy drinks" meaning "fizzy drinks") is a part of a rather giant delusional activity called "science". "Scientists" who partake in this activity believe that they are able to explain everything in the universe, possibly including life. Most of the time, these madmen-who call themselves "physicists" in particular-either continue "scientific inquiries" into the fundamental nature of matter, time, and space-often oblivious to the matter at hand, the time of their next dentist's appointment, or the clutter taking up their desk space-or teach other less specialised lunatics to do the same.
Contents- 1 The "scientific method"
- 1.1 Experiment versus theory
- 2 Brief history
- 2.1 Aristotle's Physics
- 2.2 Newtonian mechanics
- 2.3 Einstein's relativity
- 2.4 Quantum mechanics
- 3 A final unity?
- 4 See also
- Ask a question. However, the question cannot be one that is actually sensible or relevant. Rather than "When is the electricity billpayment due?" or "What happened last night?" or "Why am I trying to explain the fundamental forces and particles behind everything in the universe when I am left unable to even explain what happened last night?", the question must be one that asks for the reason behind a natural phenomenon. "What is the mechanism responsible for breaking the electroweak gauge symmetry, giving mass to the W and Z bosons?", for example, is a question sufficiently esoteric and unanswerable enough for the megalomaniacal scientist.
- Make further observations. Common sense is once again no help-simply observing "Perhaps I should go and write that cheque for the electricity bill rather than take part in an internationally funded experiment worth its weight in antimatter" satisfies not the eternally curious and curiously delusional mind of the physicist. Further explorations of the W and Z bosons as well as electroweak interactions is the path to take in this example.
- Form a hypothesis. A hypothesis here means a reasonable explanation for the physicist's observations. Such an explanation is much easier to craft than an explanation for what the physicist is doing, which is clearly inexplicable and delusional and not too late to undoyet. A typical scenario for the theoretical physicist. Experimentalists simply have not the sufficient funds to rip the universe a new space-time singularity at which all known laws of physics break down.
- Perform an experiment. At this point, the physicist is past the event horizon and already immersed in the delusion of being able to explain everything that happens around him. (The writer has taken the liberty of assuming the physicist to be male, since generally females are far too rational to go into physics-ed.) Therefore, he may as well go and do an experiment to see how wrong the hypothesis was about these bosons.
- See how wrong the hypothesis was. Obviously, the physicist is wrong. There is the off-chance that the hypothesis may have been right. In this case, fifteen minutes of fame will ensue before another physicist shows the hypothesis to have been wrong after all. The original physicist may still console himself with the fact that this other physicist will eventually himself be proven wrong as well.
- Adjust the hypothesis and try again. In everyday interactions with sensible people who do sensible things, this is called either "a correction" or even "changing your story". However, in the scientific community, it is termed "progress".
Therefore the world of physics is now split into experimentalists who perform experiments yet do not attempt to explain their results, and theorists who attempt to explain experiments that have not even been performed, largely because they involve bending and rending apart the space-time continuum and often in some apocalyptic manner. Nonetheless, to attempt to explain things without even observing them is quite a leap. To understand why such a split has developed, we must delve into the history of physics.
Brief historyThe history of physics is a series of theories, confirmation and vindication of said theories, widespread acceptance and praise and worship of said theories, and complete and total destruction of those theories.The periodic table of classical elements. Had Aristotle's idea been accepted up to modern times, chemistry would have been drastically simplified, as well as termed alchemy. Aristotle's PhysicsIn ancient Greece, one may safely say that Aristotle wrote the book on physics-indeed, wrote a book titled thePhysics (Greek: Φυσικῆς ἀκροάσεως, Latin: Physicae Auscultationes, Pig Latin: Ectureslay onway Aturenay) and made various other discoveries and arguments outside of this book. Aristotle chiefly concerned himself with the phenomenon of motion of objects, with these chief axioms:- All objects are composed of four elements. If correct, this would have meant that the weight of all objects were determined by the proportions of earth, water, wind, and fire, and would also have considerably simplified the Periodic Table. Under Aristotelian physics, the present issue of global warming would be explained by excessive fire and wind.
- Objects move towards their natural settling place. Most rocks have a natural place on the ground, which is why letting go of them from directly above your feet is a rather bad idea. It also explains the tremendous speed with which schoolchildren move towards their natural settling place in front of the telly.
- The speed of something falling is proportional to its weight. This is the reason for which Henry VIII's health failed dramatically quickly.
However, this system of pseudoscientific beliefs did not last very long-a mere two millennia or so. Eventually,Galileo Galilei (full name Galileu Galileo Galilei Galilee Galilea) proved that things did not fall at rates proportional to their weight by dropping two balls of different density off the Leaning Tower of Pisa which hit and killed a skinny man and an obese man whose heart rate fell at virtually the same rate. Galileo also went against Aristotle in claiming that objects would keep moving until some force resisted this motion. For instance, one may continue to move to reconsider until the chair presiding over the meeting denies him/her this.
Newtonian mechanicsEven the shred of credibility that Aristotelian physics had left was wholly destroyed by the work of delusional maniac Sir Isaac Newton. Chiefly known for his pursuit of alchemy, brief tenure as warden of the Royal Mint, and publications on analysis of scripture and predictions of theApocalypse, he also completely changed forever humankind's understanding of motion and gravity-but only somewhat completely.Sir Isaac Newton refuted the theory that 2012would mark the end of the world, saying that this, of course, would instead be 2060.Newton confirmed Galileo's principle of "inertia" (derived from the Latin word for lazy), and also postulated two more laws of motion from his own observations.
- The Second Law of Motion states that F = ma, where F is force, m is mass, and a is acceleration. Therefore this mathematical formula postulates that force is equal to "massacceleration", and that the unit of force is the kilogrammetres per second per second.
- The Third Law of Motion states that for every action there is a reaction equal in magnitude, opposite in direction, and unknown as to whether or not anyone should actually care about it.
In addition, he postulated that the force that drove objects to the surface of Earth was the same force as that which held the Moon in orbit of Earth. However, as if the concept of force at a distance were not enough to inhibit Newton, the mathematical tools that existed in his time were also inadequate for Newton's kinematical and dynamical needs. Therefore, he made maths up as he went along and called it "fluxions". Today, billions of schoolchildren worldwide suffer the consequence of Newton's mathematical trickery and subsequently run out of the classroom screaming. Most are still traumatised by the sight of the integral sign ∫ and unable to studyShakespeare in its original form due to the long s (ſ).
Newton also put forward a theory that light was composed of "corpuscles", i.e. particles of light. But his rival Robert Hooke, when he happened to not be fiddling with his Slinky toys or his dead plants, had put forward a wave theory of light. Somehow, a Scotsman named James Clerk Maxwell proved both of them wrong. According to Maxwell, light did not exist by itself, but rather was part of a unified field called the electromagnetic field. As its name implies, the electromagnetic field also included the superpowers Elektra and Magneto. This new electromagnetic theory was hailed as a crossover of the Daredevil and X-Men series and deemed revolutionary at the time. With Newtonian gravity and mechanics and Maxwell's equations of electromagnetism, many hoped that physics could finally predict everything in a "clockwork universe". In retrospect, this carries heavily ironic connotations since Newtonian mechanics would get nul points if that clockwork were running anywhere near the speed of light. Nonetheless, it seemed at the time that physics was at an end.
Einstein's relativityHowever, Maxwell's theory relied on an antiquated piece of physical science called the luminiferous aether. This theory posited that since electromagnetic waves clearly need a medium through which to travel, physicists could just make up a story about diethyl ether permeating the entire universe. Regardless to say, this was a poor excuse for a scientific theory and was just waiting to be disproven by an experiment, which it was. People finally realised that the speed of light was the same in all reference frames and media-or at least Albert Einstein did, since everyone else was far too surprised that humankind's understanding of the universe was still evolving.According to mass-energy equivalence, even a strand of Einstein's hair would carry explosive amounts of energy at the scale of several atomic bombs. Evidently, some of this energy already went into Einstein's disastrous haircut.Einstein also posited a series of incredibly outlandish proposals that allegedly resulted from his theory of special relativity:
- Mass-energy equivalence. Essentially, E = mc2. Nobody knows what mass-energy equivalence actually means beyond that equation.
- Invalidity of simultaneity. Two events that appear to happen at the same time from one person's point of view may not necessarily happen at the same time from another person's point of view. This means that whenever the narrator said "Meanwhile, somewhere else" and cut to another scene, he was lying.
- Motion faster than light is impossible. This result has led to countless professors using a tired old metaphor and describing the speed of light as a "universal speed limit". As a result, the Galactic Ministry of Hyperspace has repeatedly been forced to reassure citizens that the actual universal speed limit remains at 90 000 kph, and that piloting at the spaceship at the speed of light may endanger everyone on the hyperspace motorway.
These theories were surprisingly substantiated by prominent figures, including Planck, Minkowski, and the universe. Einstein, however, was less happy with his theory than nature was. In what may be one of the most self-defeating moves in the history of physics, Einsteincorrected his own theory, and replaced special relativity with general relativity, which saw gravity as a result of the bending of an elastic sheet. A good analogy is to the space-time continuum-in the same way that a heavy metal ball distorts the space-time continuum, so does a star bend an elastic sheet.
Quantum mechanicsHowever, Einstein never quite got around to explaining electromagnetism-being a hardcore DC Comics fan-or any of the nuclear forces, having taken up the fight against nuclear warfare. The nature of light, nuclear interactions and small-scale forces were thus left to others.The last major theories on light were Newton's theory of corpuscles and Hooke's wave theory of light, later Maxwell's theory of light as electromagnetic radiation in wave form. Somehow, Planck, Einstein, and de Broglie managed to prove all of them wrong-or, more accurately,possibly wrong. The end result of all of their research was that all of matter had properties of waves as well as those of particles. This would be a strange result of physics were it not for every single other thing quantum mechanics predicts.
In a move whose probability of being one of the most self-defeating moves ever in the history of physics is determined by the wave function , quantum physicists admitted that they were a little fuzzy on what happened at the smaller scales of physics research. Position and momentum of a subatomic particle could not both be ascertained with absolute precision; every particle has a range of possible positions and times described by a wave function that only collapses with an observer; and Erwin Schrödinger, realising just how utterly ridiculous this was, cracked a joke about a cat in a box that would continue for the next few centuries.
A final unity?Even today, despite the awesomeness of Richard Feynman having graced our world, we cannot explain gravity through some quantum mechanism. Quantum gravity that is compatible with general relativity would give us a unified vision of the world, and indeed-as these delusional maniacs believe-a complete and total explanation of everything that has happened, is happening, and will happen in the universe. Physics researchers would lose their jobs and-since they have no common sense-rejoice and celebrate. All would be explained by a single theory of the world after all.That is, until some lunatic proves it wrong.
See alsoFor those without comedic tastes, theso-called experts at Wikipedia have an article very remotely related tophysics.
- Chemistry
- Mathematics
- Astronomy
- Cosmology
- Nobel Prize
- String theory
Featured ArticleFeatured version: 1 September 2010This article has been featured on the front page. - You can vote for or nominate your favourite articles at Uncyclopedia:VFH.
- article
- discussion
- edit
- history
- watch
- Log in / create account
navigation
- Main Page
- UnNews
- Featured content
- Babel
- Recent changes
- Random page
- Help
- Things to do
- Report a problem
community
- Community portal
- Village Dump
- Chatroom
- Pee Review
- Votes for Highlight
- Votes for Pictures
- Requested Articles
- Bookface
- UnShoppe
rating
- 1
- 2
- 3
- 4
- 5
average rating: 4.3
search
toolbox
- What links here
- Related changes
- Special pages
- Printable version
- Permanent link
wikia
- Chatroom
- Wikia messages:
The site isn't broken! Yay!
- This page was last modified on November 30, 2010, at 03:22.
- Privacy
- About Wikia
- Terms of use
- Contact Wikia
- Advertise
- Wikia® is a registered service mark of Wikia, Inc. All rights reserved.
What is the purpose of fixed resistor?
To lower the voltage and amperage in order to better fit the needs of other components.
Voltage, current, and resistance can be related by this formula. V = iR, where I is the current. Assuming that the voltage stays constant, current will decrease. Hope this helps!
It depends on what you mean by 'voltage'. For example, if you mean electromotive force (e.m.f.), then the internal resistance of a battery or generator will cause an internal voltage drop, resulting in the terminal voltage being lower than the open-circuit voltage and the greater the load, the lower the open-circuit voltage.
On the other hand, if you are asking 'how' do you reduce voltage, then there are various ways. For a.c. voltages, we can use a step-down transformer. For d.c. voltages, we can use a variable resistor connected as a potentiometer, or a pair of fixed-value resistors to form a voltage divider.
