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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 safety hazards of electronic circuits?
there are several ways of safety hazards in electronic circuits those are those are -
1- capacitors are dangerous if they charged discharge it before handling.
2- the high voltages are present somewhere in electronic circuits like EHT on television mind these.
3> static charge of body can damage cmos ics don't touch them from naked hand.
4> ground all equipments before using them it will prevent from electric shock.
What happens in the depletion region in reverse bias?
in forward biasing depletion region width decreases and in reverse biasing it increases .
What is HT and LT current and voltage?
A 'bushing' is a tubular insulator used to insulate a conductor that passes, for example, from the inside of a transformer or circuit breaker to the outside, enabling the internal components to be connected to external supply lines.
High-voltage (or 'high tension') bushings have thicker walls and are longer than low-voltage bushings, as they have to withstand higher voltages.
How many transistors can you find on CPUs today?
The no.of transistor integraeted in the prosses..................
What is the current in a 100 volt circuit with 25 ohms of resistance?
Using Ohm's law V:IR .I:V/R..I:100/5-20...I-20ampere
Does electromagnet work only on DC?
They normaly are. AC ones tend to buzz.
The core has to be of soft iron or laminate, so that the field collapses properly when the current is switched off.
When adding resistance in a series circuit what happens to supply voltage?
In a series circuit...
Kirchoff's current law: The sum of the signed currents entering a node is zero. Since a series circuit consists of only nodes each connected to only two elements, this means that the current in every point in a series circuit is the same.
Kirchoff's voltage law: The sum of the signed voltage drops in a series circuit is zero. This means, that if you segregate the sources from the loads, the total voltage across all the nodes is equal to the total voltage across all the sources.
That may seem trite, but take the case where you have one battery in series with two resistors also in series. If you know the voltage across one resistor, then you know the voltage across the other resistor - it is the battery voltage minus the first resistor's voltage.
Ohm's law: Voltage is current times resistance. This actually applies everywhere; series circuits, parallel circuits, DC circuits, AC circuits, etc.
How do you design printed circuit board?
If you want to know a printed circuit board is designed here is the explanation in simple terms.
1. First you decide on the components which are in the design.
2. Need a software in which you can get symbols (both schematic symbols and physical symbols) of standard components and which also allows you to create your own symbols for new components which are not in the standard tool library.
3. In schematic capture tool, you will use symbols of components and also connect the pins of components with wire lines to complete the schematic drawing. Based on complexity and size of the design this can be few pages or hundreds of pages.
4. In the layout tool you will have to make a board outline (based on the shape/size of PCB you want to design) and define number of layers etc.
5. Schematics need to be exported to layout using the board outline you designed. Result will be that all the physical symbols will appear in the layout tool along with un-routed wire connections.
6. Now you can place components on the PCB based on floor plan (where you want to place what components) and start routing the connections. Decide thickness of routes or traces based on impedance and current these nets need to carry. Based on how many layers have been defined and needed as per design traces can run through multiple layers
7. When routing is complete, with help of tool you need to create PCB fabrication data for PCB fabricator.
These are top level steps involved in a PCB design. There are finer steps like back annotation (process to sync up layout and schematics) which also important. Many tools give options for auto placement, auto routing which can aid in the design. These used with proper constraints and care can help speed up the design process. Check for PCB tool vendor websites.
- Neeraj
AnswerProton led displays says:Go to www.circuitboards.com scroll down to the links area and click free cad software by cadsoft. My friend told me the other PCB designing software mentioned makes you pay for there software if you want it manufactured outside of there facility. Basically locking you into there price or no price. Cadsoft is free up to a certain layer count I believe.
How do you design 32 to 1 multiplexer b using a 4 to 1 multiplexer?
To build a 64 to 1 multiplexer using cascaded 8 to 1 multiplexer, use nine 8 to 1's. Connect the first 8 to each of the 64 inputs, then connect the ninth to the outputs of the first eight. Connect the three address lines of the eight together to form 3 of the address lines. Connect the three address lines of the ninth to form the other three, for a total of 6 address lines selecting 1 of 64 inputs.
This is a lot of logic. Fan-in and fan-out may be considerations. If you are trying to scan 64 switches, there may be a better way using an 8-bit output connected to a switch matrix (with diodes if you need more than one at a time close-able) and then connected to an 8-bit input. Even better, consider the 8279 keyboard/display controller.
What is the difference between baseband coaxial cable and broadband coaxial cable?
Iam pretty sure that baseband coax was 50 ohm and was used for networking computer, were broadband coax is 75 ohm and used in the cable tv industry.
A baseband signal is the original signal before it is modulated onto a carrier, mulitplexed or mixed.
A broadband signal contains many channels which have been modulated or multiplexed onto a common carrier.
The significant difference is the bandwidth of each.
The impedance of the cable which carries either of them is totally irrelevant to the definition.
Well, to the best I can understand (I'm just learning this stuff, so sorry if I'm wrong) It would be a n-type if you doped the Ga, (i.e. replace a Ga atom with a Si atom, as the Si has an extra electron that would be forced to go to the conduction band. If you doped the As with the Si, it would be a p-type as there would be one fewer electron than normal.
What does an emitter resistor do?
The emitter of a bipolar transistor (junction or point contact type) emits charge carriers(electrons in an NPN, holes in a PNP) through the base towards the collector.
Why is a tank filled with water a good conductor?
Pure water is NOT a good conductor because it has very few ions in it. However if you add a little salt to the water it does become a good conductor as the salt provides the ions required to conduct electricity.
How light emitting diode is used in remote control?
In ordinary remote controls for devices such as televisions & DVD players, infra red light is used (naked to the human eye).
What is the total power in a circuit with a current of 4 A and a resistance of 12 ohms?
In DC circuits, V = I / R, and P = V*I
You can use these to get P = I^2 * R = (4)^2 * 12 = 192 watts.
Does a variable resistor have a bias?
A variable resistor means that the resistance can be varied, usually by using a slide. A fixed resistor can not be varied.
Does a capacitor reduce electricity?
Absolutely not, if you are a residential consumer. Capacitors, when used for power-factor correction, reduce the supply current but NOT the amount of energy consumed and you pay for energy, NOT current! Energy meters measure the supply voltage and the in-phase (resistive) component of the supply current, so power-factor correction is irrelevant to residential metering. The video referred to in the original answer shows current being reduced but, as explained, this has absolutely no relevance to your electricity bill. In fact, the video is complete and utter nonsense! Capacitors used in this way are a complete scam.
Power-factor correct ONLY applies to large commercial and industrial consumers because they are penalised for unnecessarily-low power factors because the resulting unnecessarily-high currents require the utility companies to install larger transformers, switchgear, and cables.
Another Answer
Yes, if you are a big customer and you are paying a premium on your power charges through having a poor power factor on the site. Otherwise a capacitor does not reduce the kWh consumption of your appliances, but it might reduce the current you draw, but your meter measures energy used and not the current. For a domestic customer power factor correction will almost certainly notreduce your charges.
Can a circuit be a combination of series connections and parallel conections?
Yes. There are also more complicated circuits, that can't be described ONLY as a combination of series and parallel circuits - basically, circuits that contain several loops.
Is electrical power measured in coulombs?
Yes, it can be measured. Coulombs is a measure of charge. 1 ampere second = 1 coulomb. With DC current you simply multiply your current by time applied. For alternating current you would need to integrate, Although if all you have are data points, (which is more likely) you would probably use Simpson's Rule to approximate the amount of charge. Keep in mind that Coulombs is a scalar quantity (an amount) and Ampere's is a vector quantity. so Ampere has a magnitude and direction.
The other way you can measure Coulombs is to count electrons. take the number of electrons and divide by 6.24e18 (the approximate number of electrons to make a coulomb). But I'm unsure on how to count individual electrons.
~Hipcat
What are disadvantages of a smoke signal?
Walkie talkies are not a subsitute for cell phones. They are meant for broadcast mode (talking in a group mode) . Typically used in construction, security, schools and colleges, outdoor catering, airlines, tea and coffee estates, golf courses, resorts, event management and sports.
they can go out of range and have a small number of channels that they can communicate to each other on. The biggest limitation of Walkie Talkies, besides being low power (not good for more than 2 - 3 city blocks) is 1) Only one person can talk at a time, and 2) Everyone else with a Walkie Talkie can hear what you are saying to your friend if they are within 2 - 3 city blocks of your house.
Why does a midi system have a wide range of Frequency?
The MIDI (Musical Instrument Digital Interface) system does not care about the range of frequency of the actual instrument it is playing. It is an event oriented system, much like a player piano, not like a tape recorder, so what is recorded are key down and key up (and other) events, rather than musical waveform events.
What is the connection between the bandwidth of a signal and the data rate that it represents?
The data rate (C) is equal to the bandwidth (B) times the logarithm base 2 of 1 plus the signal-to-noise ratio (S/N) (how much interference is introduced in the transmission of data)
C = B x log2(1 + S/N)
So your data rate is directly proportional to your bandwidth. If you increase your bandwidth, your data rate will also increase provided the signal-to-noise ratio isn't affected.
What is a nonlinear electrical load?
It must mean a load that is not constant, or does not follow a straight line relation with some other parameter. For example air resistance- the drag on a vehicle increases as the square of the speed, so the load on the motor increases at a similar rate ( or at least that part of the motor load used to overcome air resistance)
