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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 latest inventions in Electrical Electronics Engineering?
A new semiconductor material named graphene is invented by two researcher andrenove and konstantin novoselove. this will help us to makes the transparent screen or display.It is a another type carbon which is not used as semiconductor.
Why parallel resonance is termed as rejecter circuit?
THE PARALLEL rlc CIRCUIT IS CALLED A REJECTOR CIRCUIT BECAUSE IT REJECTS DOWN THE CURRENT. THE REASON IS AT RESONANCE THE IMPEDENCE OF THE CAPACITOR BECOMES EQUAL TO THAT OF THE INDUCTOR SO NO CURRENT FLOWS. AT LOW FREQUENCY THE CAPACITIVE REACTANCE IS LOW SO ALL THE CURRENT FLOWS THROUGH THE INDUCTOR AND WHEN THE FREQUENCY IS HIGH ALL THE CURRENT WILL FLOW THROUGH THE CAPACITOR BECAUSE AT THAT POINT THE REACTANCE OF THE CAPACITOR IS LOW. SO WE OBTAIN A V-SHAPED GRAPH WITH THE PEAK OF V INDICATING THE REJECTION OF CURRENT IN PARALLEL R-L-C CIRCUIT CIRCUIT,AT RESONANCE,IMPEDANCE IS MAXIMUM AND CURRENT IS MINIMUM.HENCE, SUCH A CIRCUIT WHEN USED IN RADIO STATIONS IS KNOWN AS REJECTOR CIRCUIT BECAUSE IT REJECTS OR TAKES MINIMUM CURRENT OF THAT DESIRED FREQUENCY TO WHICH IT RESONATES.(THIS RESONANCE IS OFTEN REFERRED TO AS CURRENT RESONANCE BECAUSE THE CURRENT CIRCULATING BETWEEN THE TWO BRANCHES IS MANY TIMES GREATER THAN THE LINE CURRENT TAKEN FROM THE SUPPLY.THE PHENOMENON OF PARALLEL RESONANCE IS OF GREAT PRACTICAL IMPORTANCE BECAUSE IT FORMS THE BASIS OF TUNED CIRCUITS IN ELECTRONICS.)A PARALLEL R-L-C CIRCUIT HAS THE PROPERTY OF SELECTIVITY I.E.IT CAN SELECT THE DESIRED FREQUENCY FOR AMPLIFICATION OUT OF A LARGE NUMBER OF FREQUENCIES SIMULTANEOUSLY IMPRESSED UPON IT.FOR INSTANCE IF A MIXTURE OF FREQUENCIES INCLUDING RESONANT FREQUENCY IS FED TO THE INPUT THEN MAXIMUM AMPLIFICATION OCCURS FOR THE RESONANT FREQUENCY.FOR ALL OTHER FREQUENCIES ,THE CIRCUIT OFFERS VERY LOW IMPEDANCE AND HENCE THESE ARE AMPLIFIED TO A LESSER EXTENT AND MAY BE THOUGHT AS REJECTED BY THE CIRCUIT.
How long will 55 watts run off of 9 volts?
you need to know the current used with a load. to develop power
P = I X E
When people use the term "Xerox machine" they usually refer to a copier or a printer. In that sense, a Xerox machine is used to make copies of documents, or images of other small objects that can be placed on the platen, or to print the output from a computer or facsimile (Fax) machine
What is the difference between 800 mAH and 700 mAH?
These figures represent capacities of use for batteries. If a device uses 50 mA an hour on a 800 mAH battery, the device would operate for 16 hours before depleting the battery. If the same device was connected to a 700 mAH battery, the device would operate for 14 hours before depleting the battery.
What is the difference between a modem and multiplexer?
A decoder takes n inputs and produces 2^n outputs. An encoder takes 2^n inputs and produces n outputs.
A multiplexer selects one line from many lines. The inverse of selection is distribution. A demux essentially transmits data from one line line to 2^n possible output lines. The output line is determined by n select lines. In short, a multiplexer selects an input line, a demultiplexer selects an output line.
The differences between these two circuits is subtle, as far as I can tell. A demux simply selects an output line, nothing more. It's a glorified switch. A decoder takes n inputs, and uses those inputs to determine which of the 2^n output lines is high. This is the difference, I think. A decoder is designed to simply keep one line high. A demux is designed to set one output equal to the input (whether it be high, low, or a changing signal).
well when you see on basis of output voltage the centre tapped transformers is .
Why you are generating ac not dc?
question is wrong....ac is generated in alternator
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The most likely reason is that there is no field voltage being generated. This is controlled by the voltage regulator. Check to see if you are getting a DC field voltage. On the voltage regulator there are terminals to different pieces of equipment on the machine. Look for the terminals that are designated F1 and F2. These should have a DC voltage on them. Also look for a potentiometer that controls the field voltage. Turn it one way and the voltage will go down and turned the other way the voltage will go up. Make sure that this potentiometer is in the correct position to allow voltage to the field coils.
When a wire is amde smaller the resistance increase what happen to the electric current?
If a circuit existed where a wire could be made smaller AS the current from a defined source was applied to a defined user then in terms of amperage there would be little change in that parameter. In terms of the Power dissipated as heat through the electrical resistance of the wire then the wire would exhibit a marked increase in the heat expended (Power -watts= amperage- I x voltage -E) . With this in mind and using the same formula as noted the increase in P can only be attributed to an increase in E .To maintain the amperage -I. In short the smaller the wire the greater the voltage must be to maintain a set unit of amperage. In real world projects however the user raises wire size and does not modify voltage to maintain the amperage capacity. This is covered by the idea of calculation of voltage drop in a conductor based on its cross sectional area. From your question let me remind you that amperage is a function of usage and although stated on many devices does not exist until a circuit is closed ..Have a good one Edesigner.
How to troubleshoot the Integrated circuit?
A: Each IC has unique operating parameters never the less it require instruments. A VOM can solve some problems but never all of them. For instance an amplifier oscillation it may Lock like a bad part but there is nothing wrong with the component if the oscillation is stopped. An oscilloscope can display the problem visually and it can be fixed, The oscilloscope may display the problems but interpreting the display is an art by itself.
What is input impedance of a circuit?
Impedance is the total opposition to current flow. It includes both resistance AND reactance (capacitive and inductive). Impedance varies with frequency, while plain resistance does not.
Scroll down to related links and look at:
"Different names for the two impedances Z1 and Z2"
"Calculation the damping of impedance bridging or power matching an interface connecting Zout and Zin"
"Impedance bridging or voltage bridging of two audio units".
What is the value for micro farad?
1 microfarad (μF) is equivilent to one-millionth (10-6) of a farad.
Therefore, 1F = 0.000001μF
:)
Is the transmitted telephone signal ac or dc?
The line current used in a telephone system is DC. The actual line voltage used depends on the particular make and type of telephone system.
The voltage is supplied by Hugh batteries which are kept fully charged most of the time, except, of course when there is a general power outage. If an outage goes on for more than a short time, most telephone companies in developed contries have standby generators - running on diesel or petrol - to ensure their batteries stay charged-up.
How many miles per gallon for 747 plane?
A plane like a Boeing 747 uses approximately one gallon of fuel (about four liters) every second. Over the course of a 10-hour flight, it might burn 36,000 gallons (150,000 liters). According to Boeing's Web site, the 747 burns approximately five gallons of fuel per mile (12 liters per kilometer). That's just 0.2 miles per gallon!
That sounds like a tremendously poor miles-per-gallon rating! But consider that a 747 can carry as many as 568 people. Let's call it 500 people, because on most flights not all seats are occupied. A 747 transporting 500 people one mile uses five gallons of fuel. That means the plane is burning 0.01 gallons per person per mile. In other words, the plane is getting 100 miles per gallon per person! The typical car gets about 25 miles per gallon, so the 747 is much better than a car carrying one person, and compares favorably even if there are four people in the car. Not bad when you consider that the 747 is flying at 550 miles per hour (900 km/h)!
How can you use Ohm's Law to help you find out why a toaster stoped functioning?
You can use ohm's law, which says I=E/R. You should find how many volts that the power supply is, then find out the current flow through the wires. if the current flow is not what it should be, then your resistor is not working properly. Therefore the resitor would be the problem.
What is voltage of TTL circuit?
CMOS gate circuits have input and output signal specifications that are quite different from TTL. For a CMOS gate operating at a power supply voltage of 5 volts, the acceptable input signal voltages range from 0 volts to 1.5 volts for a "low" logic state, and 3.5 volts to 5 volts for a "high" logic state. "Acceptable" output signal voltages (voltage levels guaranteed by the gate manufacturer over a specified range of load conditions) range from 0 volts to 0.05 volts for a "low" logic state, and 4.95 volts to 5 volts for a "high" logic state:
It should be obvious from these figures that CMOS gate circuits have far greater noise margins than TTL: 1.45 volts for CMOS low-level and high-level margins, versus a maximum of 0.7 volts for TTL. In other words, CMOS circuits can tolerate over twice the amount of superimposed "noise" voltage on their input lines before signal interpretation errors will result.
CMOS noise margins widen even further with higher operating voltages. Unlike TTL, which is restricted to a power supply voltage of 5 volts, CMOS may be powered by voltages as high as 15 volts (some CMOS circuits as high as 18 volts). Shown here are the acceptable "high" and "low" states, for both input and output, of CMOS integrated circuits operating at 10 volts and 15 volts, respectively:
The margins for acceptable "high" and "low" signals may be greater than what is shown in the previous illustrations. What is shown represents "worst-case" input signal performance, based on manufacturer's specifications. In practice, it may be found that a gate circuit will tolerate "high" signals of considerably less voltage and "low" signals of considerably greater voltage than those specified here.
Conversely, the extremely small output margins shown -- guaranteeing output states for "high" and "low" signals to within 0.05 volts of the power supply "rails" -- are optimistic. Such "solid" output voltage levels will be true only for conditions of minimum loading. If the gate is sourcing or sinking substantial current to a load, the output voltage will not be able to maintain these optimum levels, due to internal channel resistance of the gate's final output MOSFETs.
Within the "uncertain" range for any gate input, there will be some point of demarcation dividing the gate's actual "low" input signal range from its actual "high" input signal range. That is, somewhere between the lowest "high" signal voltage level and the highest "low" signal voltage level guaranteed by the gate manufacturer, there is a threshold voltage at which the gate willactuallyswitch its interpretation of a signal from "low" or "high" or vice versa. For most gate circuits, this unspecified voltage is a single point:
What is the resonant frequency of gold in hertz?
Previous answer: 1,729 MHz
There is no "resonant frequency" of gold. Gold does have an NMR frequency, which is 1.729MHz. All NMR frequencies are dependent on the ambient magnetic field, and gold's 1.729MHz is valid for a magnetic field of 2.35 Teslas, which is 45,000 times stronger than a typical Earth field strength. But there is no resonant frequency which, if you broadcast it, will cause gold to resonate.
A circuit in which output feeding back to input to increase or decrease the gain is called feedback circuit. Basically part of output feeding to input in such way that it increase the value of input is positive feedback and it also increase gain of circuit and similarly to it when part of output feeding to input in such way that it decrease the value of input is called negative feedback it also decrease the gain of circuit.
Where can one find information about a digital circuit?
One can find information about a digital circuit on a number of different informational websites. One can find information on digital circuits on Wikipedia, HowStuffWorks, and Infoplease.
How do you work out the current in a circuit?
we can calculate the current in a commmon electrical circuit by this formulae i.e,I=V\R where i is the current flowing in the conductor, R is resistance , V is the voltage.. THE FORMULA IS CORRECT but the term conductor does not suffice an explanation since a conductor is low in resistance R= resistance not conduction.
What happens if i use a 12v Dc in a device that requires 9v DC And can it be repaired?
Not a good idea. It will raise the current that could burn out components. To repair you would need to determine what was burned out and how easy it would be to replace.
What are the names of the different kinds of circuits?
there are 2
Series circuits and parallel circuits
Further AnswerThere are, in fact, four categories of circuit: series, parallel, series-parallel, and complex. 'Complex' includes any circuit that's not one of the other three.Series and Parallel
Pure semiconductors are insulators at room temperature. Impurities must be added to imbalance the covalent bonds of the crystal structure to make them conduct. This process of adding impurities is called doping. Dopants are usually selected from the columns immediately left (P type dopants producing hole current carriers) and immediately right (N type dopants producing electron current carriers) of the column of semiconductors on the periodic table.
By varying the amount of dopant the resistivity of the semiconductor varies inversely.
By using opposite type dopants adjacent to each other a PN junction forms, which can be used to make diodes, transistors, etc.
By doping an area of the semiconductor, oxidizing the surface of that area and plating the oxide with metal a MOS capacitorcan be made.
Components are wired together to make a circuit by covering the chip with an insulator (typically an oxide or nitride), etching holes in the insulator to the component contacts, plating the chip with metal and etching away the metal where you don't want things connected.
Thus doping (and a few other process steps) allows you to create all electronic components except inductors (and those can either be connected externally or simulated with a circuit called a "gyrator" consisting of a capacitor and several opamps) needed to make monolithic ICs.
