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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
Mostly because of their cost but also because silicon transistor have faster switching properties and are far more resistant to damage by heat. Silicon transistor also have a much wider operating band.
Difference in parallel and series circuits?
If two or more circuit components are connected end to end like a daisy chain, it is said they are connected in series. A series circuit is a single path for electric current through all of its components. Bulbs will get dimmer the further along the chain. If two or more circuit components are connected like the rungs of a ladder it is said they are connected in parallel. A parallel circuit is a different path for current through each of its components. A parallel circuit provides the same voltage across all its components and hence the same brightness of bulb.
The voltage is the same in a parallel circuit while the voltage is shared in a series circuit.
What is the relationship between RMS and peak voltage for a square waveform?
RMS and peak voltage for a square waveform are the same. There is a small caveat, and that is that you'd have to have a "perfect" square wave with a rise time of zero. Let's have a look. If we have a perfect square wave, it has a positive peak and a negative peak (naturally). And if the transition from one peak to the other can be made in zero time, then the voltage of the waveform will always be at the positive or the negative peak. That means it will always be at its maximum, and the effective value (which is what RMS or root mean square is - it's the DC equivalent or the "area under the curve of the waveform") will be exactly what the peak value is. It's a slam dunk. If we have a (perfect) square wave of 100 volts peak, it will always be at positive or negative 100 volts. As RMS is the DC equivalent, or is the "heating value for a purely resistive load" on the voltage source, the voltage will always be 100 volts (either + or -), and the resistive load will always be driven by 100 volts. Piece of cake.
Why Common Emitter Configuration is most commonly used in amplifier circuits?
the common emitter configuration is most widely used in amplifer circuits because of its high voltage,current & power gain.
the common emitter configuration is most widely used in amplifer circuits because of its high voltage,current & power gain.Why amplifier is called amplifier?
The root word "ample" means abundant, having lots of something, as in, we had ample food to eat at the feast. To amplify means to make something more ample. So when it comes to sounds, if you take a faint sound and make it louder, you are amplifying it. That is what an amplifier does.
Why is a crystal oscillator required in a radio transmitter?
SOME kind of oscillator is required, to create the AC signal that will be modulated,
amplified, and eventually sent up to the antenna to be transmitted. It doesn't
have to be a crystal oscillator, though.
What is the frequency range of AM radio?
They are methods of transmitting signals (speech, music,data etc) on carrier frequencies. FM is Frequency Modulation where the carrier frequency is modified by the signal frequency. AM is Amplitude Modulation where the carrier amplitude (size) is modified by the signal
How does a semiconductor work?
we know that in a transistor we have three types of regions: EMITTER, COLLECTOR, BASE, and we know that emitter is highly doped, so charge carriers are very high, so resistance is very less, and on the other side collector is moderately doped so charge carriers are less, so resistance is very high. So from the above concept we conclude that in a transistor current is flowing from low resistance to high resistance. for example the 100 electrons are moving from emitter to base, in base only some (4 electrons) of the electrons are neutralized, and remaining 96 electrons are moved to collector terminal through high resistance path. so now same current flowing through high resistance so voltage amplified.
Why capacitor is connected across parallel in the output of rectifier circuit?
For filtering the out put siginals of the rictifier circuit by compensating for the gaps created during rectification by its stored charge.
How do you calculate AC load from DC load?
Amp measurement in a dc circuit is commonly done by use of a clamp on amp meter. The meter has a loop on one end that opens up. The loop is clamped around a wire, and the meter shows the amperage.
What is the Power dissipated from a 0.5A current through a 5ohm resistor?
The current I = 0.18257 amperes. Scroll down to related links and look at "Electrical voltage V, amperage I, resistivity R, impedance Z, wattage P".
Why NOR gate is called universal gate?
That title of "Universal Gate" is reserved for NAND gates because you can build all possible logic using only NAND logic . You can build even other basic logic like AND, OR and NOT using NAND.
How do you fix a wet electronic device?
There are several ways to try and dry a wet device, like an iPod or cellphone. They work to differing degrees in different times, and can be used together or alone.
- Place it in a warm, dry room for a few days, testing daily to see whether it has dried yet.
- Turn a hair dryer to low and wave it over the device from about a foot away for 20 to 30 minutes. Test it, and continue drying for another 20 to 30 minutes if necessary.
- Place it in a cup of rice (rice absorbs water, but won't clog up the device).
Using a hair dryer is a very bad idea: all it does is push the water further into the cracks and crevices of the device, making the problem worse. Rice also does not work, as it does not absorb moisture from the air, and it only absorbs a significant amount of water if the water is boiling. The only reason people say it works is that sometimes, if the device wasn't too wet to begin with, it just dries out by itself. It would have dried out without the bag of rice, but since it was in the bag of rice, people think it was the rice that dried it. Not so. The device just dried by itself.
By far the best way to dry out wet electronic devices is with silica packets. You know those little packets you find inside your new shoes, or in your medication bottle? They usually say "Silica - Do Not Eat?" These packets draw in and absorb moisture. They are put in shoes and medication bottles to keep humidity and moisture from ruining the product. Sometimes in medication bottles they come not in packets, but in little white plastic cylinders.
Every time you find a silica packet or plastic cylinder, save it. Put all of them in a sealed plastic bag, so they stay fresh and do not absorb moisture from the air. Next time one of your electronic devices gets wet, wrap it in a paper towel and seal it up in the bag with the silica packets. Wait 3 to 5 days. Your device should be good as new.
Several months ago I dropped my TV remote into a bucket of water. I didn't even notice at first, so the remote stayed submerged for nearly 10 minutes. After shaking the excess water out of it, I wrapped it in a paper towel and put it into a Ziploc bag full of silica packets and cylinders I had saved. Five days later I took it out, and it was good as new. It's still working perfectly, some 8 months later.
What causes electricity to flow?
Electrical conductors (wires) are primarily made of copper or aluminum. All metals will conduct current. Conductors are elements that have 1 or 2 electrons in the outer (valance) shell of their atoms. These electrons are loosely held or are already floating around in the crystalline lattice of the material. When a voltage is applied to a conductor, these electrons move from negative to positive, since electrons have a negative charge (like charges repel, unlike charges attract).
How do you calculate voltage drop in a parallel circuit?
The formula for a simple DC voltage drop across a cable is:
VDrop = Vmeasured at the input of cable - Vmeasured at the output of cable
This formula may seem simplistic however keep in mind that the sensitivity, accuracy and resolution of measuring instrument instrument is what is really important.
If you know the DC current flowing through the cable and the impedance of the cable then you can use Ohm's law. Vdrop = I R where Vdrop is the voltage drop across the cable in volts I is the current flowing through the cable in amperes R is the resistance of the cable in ohms.
ADDITIONAL
Calculation of the voltage drop is given by the formula below
Voltage Drop (Volt) = [(mV/Am)/1000] * I * l
Where mV/Am = millivolt drop per meter per ampere of the cable
(this information is given in the table based on IEE Wiring Regulation)
I = Current in the cable (in Ampere)
l = Distance of cable (in Metre)
See related links below
What is pin configuration of microprocessor 8088?
the pin configuration of a processor means that the diagramatic representation of block diagram of processor representing various pins and the function of that pins
How does a transformer uses induction to transform current?
at first it comes from the source then go to the winding of coil and inside the coil voltage was reduce by magnetism and with this current still flow due to magnetic flux and then come out ti the second winding
In electronics, printed circuit boards, or PCBs, are used to mechanically support and electrically connect electronic components using conductive pathways, or traces, etched from copper sheets laminated onto a non-conductive substrate. Alternative names are printed wiring board or PWB or etched wiring board. After populating the board with electronic components, a printed circuit assembly (PCA) is formed. PCBs are rugged, inexpensive, and can be highly reliable. They require much more layout effort and higher initial cost than either wire-wrapped or point-to-point constructed circuits, but are much cheaper, faster, and consistent in high volume production. In chemistry and environmental protection, PCB stands for "polychlorinated biphenyl." This class of chemical was widely used as electrical transformers because it will not burn. It was also used as a plasticiser in caulks and palstic materials. Only very limited uses of PSBs are now permitted in the United States and areas that have been contaminated with PCBs through leaks or less stringent disposal practices of the past oftenrequire extensive cleanup.
Why don't metals conduct electricity?
In a bond of metallic atoms the outer electrons are free to move: they are not attached to any particular atom. Every electron carries an electric charge and when electrons move they take their electrical charge with them wherever they go. When an electrical circuit is formed, electrons are able to move along it and that is how a quantity of electrical charge is carried from one part of a circuit to another. This free electrons are also responsible for the thermal conductivity of metals, as they can easily carry thermal energy throughout the metal.
What cables are resistant to EMI?
Fiber optic cables transfer data signals in the form of light and it is faster than traditional electric cables. It is very helpful in good and speedy communication, network and broadcasting services. Visit americancableassemblies. com or call 413-283-2515 now.
americancableassemblies. com/fiber-optic-cables/optitap/
How do you drop the voltage of a dc motor to slow it down?
You question does not say what size DC motor you are wanting to control, so this answer will have to be generic.
First of all, you DON'T drop the voltage "OF" the DC motor, you drop the voltage "TO" the motor.
The simple answer is to place a "RESISTANCE," or "RESISTOR" in series with the motor. A resistor limits the amount of current flowing through it, and thus the voltage.
If you are talking about the very small DC hobby type motors [designed for 1 to 3 volt inputs], one way would be to use a variable resistor, like a large potentiometer ["pot"], scavanged out of a discarded "old" TV or "old" radio [both "pre" solid state era].
Another trick I've used [requires a lot of trial and error] is to use an assortment of old [but working] incandescent/filiment type light bulbs [small, like from flashlights, Christmas tree bulbs, dial lights from "old" radios and TVs, etc.] as resistors.
You can experiment around with "stacking" these in series to add more resistance, with each addition slowing the motor more. And if even the largest of them slows the motor TOO MUCH, then they can be wired in PARALLEL to decrease resistance, allowing more current flow. As said above, this can require much trial and error, but it can be made to work.
Another method [if using batteries] would be to use fewer batteries in series. This only works for larger voltage motors, like out of 24/18/12/9/7.2 volt motors [like out of cordless drills for example].
As an example, consider using an 18 volt motor. To provide the "normal" 18 volts would require 12 1.5 volt alkaline batteries in series. If you used only 6 batteries, you would have reduced the voltage by half. By varying the number of batteries, you would be able to vary the motor speed. Remember however, that there is a limit to how much you can "starve" the motor and still have it run or do any work.
If your aplication allows you to use an AC power source, then another method [much more expensive] would be to use a benchtop AC powered, variable power supply.
AnswerAnother common method is pulse width modulation (PWM). The full available voltage is switched on and short time later it is turned off again. This cycle repeats continuously at a relatively high frequency (hundreds, to tens of thousands of times per second). The ratio of the on-time to the off-time determines the apparent percentage of the DC supply that the motor sees.
The circuits to drive motors this way can be relatively simple to extremely complex, depending on the size of the motor, available DC voltage, and other controls needed (such as controlling speed instead of voltage supplied to the motor).
ANSWER: motor are not voltage related but rather power related so the answer is not to reduce the voltage but to reduce the power going to it. REDUCE THE POWER WILL REDUCE THE SPEED. either reducing current and /or voltage will do the trick.
The set top box that your provider gives you is what converts the Digital signal to the analog signal.
The digital signal is compressed at the provider and sent to the end user. The "tuner" (which can be built into a tv, a set top box or a cable card) Then decompresses the digital signal and converts it into an analog signal.
There is much more to this did not know how technical you wanted your answer.
What is the lumen output for a 35W halogen?
It varies from about 600 to 1100 lumens. Typically the higher the lumens output, the shorter the lifespan of the globe. Have a look at this list of globes for purchase whih shows wattage and lumens: http://1000bulbs.com/category/75-watt-incandescent-standard-shape-light-bulbs/
