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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
What are the properties of a semiconductor?
There are a few (general) properties of semiconductors:
- Allowing current to move more easily in one direction than another
- Operating better at high temperature (as opposed to normal conductors where the reverse is true)
- The can exhibit variable resistance
- They can be sensitive to light
- They can be sensitive to heat
- Can used to produce coherent light (semiconductor lasers)
The exact property is determined by the make up of the semi-conductor
The basic element of a semiconductor memory is the memory cell. Although a variety of electronic technologies are used, all semiconductor memory cells share certain properties:
- They exhibit two stable (or semi-stable) states, which can be used to represent binary 1 and 0.
- They are capable of being written into (at least once), to set the state.
- They are capable of being read to sense the state.
Identify a leather basketball as a conductor or a insulator?
Leather is generally an insulator, unless you dope it with high concentrations of conducting materials or you ionise it, which would happen if you subject it to extremely high voltages of electricity (which may vaporise it, and if you're doing it on high quality leather bags, there goes your money). Otherwise 99.99999999% of the times it is an insulator.
Are LED lights good for your eyes?
There is some debate over LED light. A new research study has claimed that LED light may cause permanent damage to your eyes. Overall, LED's are harmful for your eyes when looking at them for long periods.
The Heckler & Koch MP5 is a family of closed bolt submachine guns developed by German weapons manufacturer Heckler & Koch (HK) in the 1960s.
The MP5 was first introduced by Heckler & Koch in 1966, under the name HK54. This name comes from HK's old numbering system: the "5" designates the model as a submachine gun, while the "4" identifies it as being chambered for 9 × 19 mm ammunition. The current name dates from when it was officially adopted by the West German government for use by its police and border guard as the Maschinenpistole 5 ("Machine pistol 5", or MP5), in mid-1966. The GSG 9 (the counter-terrorist unit of the German Federal Police) then introduced the MP5 to other Western counter-terrorist units. The MP5 comes in a few different types, the SD for infernal suppressor K for shorter barrel and vertical hand grip and no butt stock unless it is the MP5K-PDW and the MP-5N for the U.S navy
it is also a MP3 + 2
What does voltage current mean?
V=IR, voltage is directly propostional to current and resistance (by ohm's law).
CommentVoltage is not 'proportional to resistance'. Resistance is a constant, and is not affected by voltage at all.
What shape is magnetic field produced when current is passed through the wire?
it is called the thumb rule right hand curled means flux line thumb means direction of current. there will be a reversal of flux.
What is non-geostationary satellite?
A geostationary orbit is an orbit of the Earth that is circular, over the equator,
and at the right distance to have a period of 24 hours. A satellite in such an orbit
appears to hang motionless, always at the same point in the sky
Anything else is a non-geostationary orbit. A satellite in one of those appears to move
in the sky, so that if you want to communicate with it, you need a movable dish.
Why are the ammeter and the voltmeter called indicating instruments?
These are instruments that give an indication of flow of current or presence of e.m.f. with respect to specified standards.
See the related link.
How much voltage and current is given to homes?
Typically in the US, voltage is +/- 110-120 volts AC RMS (so you can get 240 total), and a typical service will be 100 Amps (I believe, but I could be wrong on "typical" here). This doesn't mean the home uses 100Amps, it means this is the peak amount the home is allowed to draw.
What is the Difference between linear IC and digital IC?
Both linear ICs and nonlinear ICs has an output voltage which is dependent on the input voltage. However, the difference is that linear ICs produce an output voltage which increases or decreases at a "fixed rate" relative to the input voltage.
Nonlinear ICs do not do this. A voltage regulator may be considered nonlinear because as you increase the input voltage the output will climb at the same rate (just like linear ICs), however, once the input voltage reaches a particular level point, the output no longer increases as you increase the input. This is at the point where regulation begins. The nonlinear IC no longer changes its output at a fixed rate relative to the input.
3 What do you like dislike about working for this organization?
That I have to fill-out surveys and then attempt to lookup the answers online.
Just write "nothing", jeeze.
You place the leads across the part of the circuit you wish to evaluate and look at the display. Choosing the right range on the meter will improve accuracy. Make sure there is no power applied to the circuit!
How does the Base Transceiver station works?
BTS works by regularly sending beacon signal in its coverage range, registration the mobile station in its coverage and as soon as the mobile station invokes service a free channel is assigned to it. MS sends its voice or data signal to BTS and BTS sends it to BSC and BSC sends it to MSC and MSC connects to the other side Mobile Station/PSTN phone/ or connects to SMSC if the service is for SMS or SGSN for internet service. Thus BTS is the first contact for connection or release of a mobile service.
The function and use of an ammeter and a voltmeter?
A: ACTUALLY they are both the same just the application makes one or the other. Their function is to measure potential difference on a load or circuitry
Faraday's law of induction is to do with a change in magnetic field inducing voltage in a wire.
A change in magnetic field around any wire will cause a potential difference across said wire. Generators use perfectly coiled wire and permanent earth magnets to induce voltage into the coils when the shaft is turning.
Generators can be used backwards as motors if voltage is applied to the coil rather than force applied to the shaft.
It measures the force of the electricity moving through a circuit.
AnswerThe volt (symbol: V) is the SI unit of measurement for potential and potential difference.
Can you convert single phase electric motor to three phase connection?
Three-phase motors will run on single-phase power. What they WON'T do is start. There is no easy way to re-wire such a large motor to run on a single phase.
Properly sized capacitors and a special relay is sometimes used on sewage lift stations (poopie stations is what we call them) to run the 3-phase pumps on single phase.
I've seen 10 hp motors used. Sometimes a lift station is needed where 3-phase power is not available The motor will not develop it's full horsepower, only about 2 thirds. A push-button can be used in place of the relay, but you will have to push the button until the motor starts then let go. If the motor stops you will need to push the button again. Usually expect several hundred micro-farads to be needed.
I have used old A/C motor-run capacitors in parallel to experimentally determine the actual size (capacitance) needed. Be sure to use correct working voltage capacitors. DANGER!!! Electricity can EASILY kill you and capacitors can blow up in your face!!!
I've seen crazy people attempt to rope-start three-phase motors (it works), connect phase converters, all sorts of weird stuff. In reality, single-phase 5hp motors are available, so the a good recommendation is to trade-in the 3-phase motor for a 1-phase motor of the size you need.
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To run a three phase equipment from a single phase source, you will need something called a "phase converter".
Before you go out and buy one, find out if a single phase motor is available to match your requirements. It will probably be an easier solution for you if you can do that.
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Depending on your application, another option with such a large motor is to get a "Variable Frequency Drive". These are somewhat expensive but will take in a single-phase input and output 3-phase.
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As always, if you are in doubt about what to do, the best advice anyone should give you is to call a licensed electrician to advise what work is needed.
Before you do any work yourself,
on electrical circuits, equipment or appliances,
always use a test meter to ensure the circuit is, in fact, de-energized.
IF YOU ARE NOT ALREADY SURE YOU CAN DO THIS JOB
SAFELY AND COMPETENTLY
REFER THIS WORK TO QUALIFIED PROFESSIONALS.
Can you switch a 220 microfarad capacitor with a 100 microfarad capacitor?
This depends on the application. It may be OK to do so, or it may result in problems. If this is an already designed circuit, and you have a 820u cap that has blown, I suggest replacing with a 1000u (in my experience, this is more common and readily available), AND i usually up the voltage rating on the cap.
Capacitors typically blow due to overvoltaging or reverse polarizing them. If they've blown before, it's likely you'll have similar problems again, which is why i go with bigger, and higher voltage rated. I hate reduing things repeatedly.
How do you install a capacitor?
It gets hooked up like a switch would be. The main power wire goes to the positive side on the cap and a short power wire comes off of the positive side of the cap to go to the amp. Ground comes from car metal to the negative side of the cap and a short ground comes off of that negative to go to the negative on the amp.
Does the current stay the same in a parallel circuit and a series circuit?
A series circuit allows only one path for the electron path to follow. This type of circuit is found in something like Christmas tree lights. But a parallel circuit allows the 2 or more path for the electron path to follow. This is primarily used in households. So no, they are not the same electrons because they are two completely different circuits.
If resistance goes up does current go down?
At constant temp.& pressure,on the same circuit,with potential difference unchanged,current reduces if resistance increases.(Ohm's law).
Why does resistance decrease in a parallel circuit?
That's true. This is because when there are several resistors in parallel, the electrons have additional paths to choose from - it becomes "easier" for them to get through. This is what the resistance expresses. You can also play around with the formula for parallel resistance:
1 / R(total) = 1 / R1 + 1 / R2 + 1 / R3 ...
Try this out with some numbers. For two resistances, an equivalent is: R(total) = (R1 * R2) / (R1 + R2).
Waves used for broadcastig radio signals are called what?
The waves used to broadcast radio signals are called RF waves and these generally lie in VHF and UHF band of electromagnetic spectrum.
What is an isolation transformer?
An isolation transformer does not have a direct electrical path from the power input side to the power output side. The term is also used to define how much electrical isolation exists between the input and output windings. For example when using line-voltage input transformers to power low voltage device handled by humans, a high degree of isolation is required for safety.
Isolated transformers often use separate bobbins for the primary and secondary coil windings, but usually the windings are just wound on top of each other with insulation in between.There is usually an electrostatic shield between windings which is tied to transformer case.
Non-Isolated transformers are becoming rare. A common example is the "Variac" which is a non-isolated variable transformer. Usually the term "auto-transformer" is used to describe non-isolated transformers. They are rarely found in consumer products.
Although any transformer with a separate primary and secondary winding is an isolation transformer to some extent, The term is usually used to denote a special-purpose transformer built just for that use. It is tested and rated to withstand a very high voltage difference, called the withstand voltage, so that even if thousands of volts are applied to the primary, it will not leak through to the protected side. These transformers are used in the medical industry, to protect patients hooked up to monitoring instruments that are powered by utility mains, as well as other uses.
An 'isolation transformer' is a transformer specifically used to electrically-isolate the secondary circuit from the primary circuit. Of course, ALL mutual transformers do this, but an isolation transformer normally has a 1:1 ratio, which means its secondary voltage is the same as its primary voltage. In other words, its purpose is NOT to change the supply voltage, but to isolate the user from the supply circuit.
Isolation transformers isolate the secondary circuit from the earthed (grounded) primary circuit. As there is no earth return from the secondary circuit back to the primary supply, isolation transformer eliminate the risk of shock between the secondary circuit and earth.
An example of an isolation transformer is a bathroom shaver socket. The output is completely isolated from the earthed supply, so users cannot receive a shock between the outlet and earth.
