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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 does negative capasity in capasitors mean?

The amount of power that capacitors can store can vary. But most sizes are larger than the size of the ship and capacitor it can increase by training the energy management.

What is voltage level of RS-232?

RS-232 is ±3 to ±15, with a maximum short circuit survivability rating of ±25. Typical implementations see ±12. The negative voltage is the marking state, or the one state at the USART level. The positive voltage is the spacing state, or the zero state at the USART level. In terms of control signals, such at DTR or CTS, MARK (negative) is false, and SPACE (positive) is true. Zero volts is invalid, representing a break state.

What is application of ic um66?

It will generate a music signal by taking a less voltage at its input side.we can use it in our commercial applications

Can you give the circuit diagram of iron box?

It would be necessary to have detailed information describing the contents of the

box. It is not valid to assume a priori that any arbitrary iron box, such as one might

encounter in repose on the ground, must contain electronic components.

Find the equivalent resistance of the circuit shown in Figure 20-37 R1 7.0 R2 6.0 R3 9.0 R4 6.0 and R5 2.0?

This looks like a question from a student's coursework. It is impossible to answer without seeing the diagram or Figure 20-37, as is stated in the question.

The actual diagram is needed to show which components are in parallel and which are in series.

If you want someone else to do your homework for you, you will either have to find out how to attach a Related Link to this question, going to a separate web page which shows the diagram, or - much better - read your course materials and answer this question all by yourself. Doing the work yourself is the only way to really learn this technical stuff!

What is an HS oscillator?

HS stands for High speed Crystal / Resonator

SUJITH

sujikj<at>gmail.com

For capacitance measurement using a bridge is it more appropriate to use DC or AC Any diff in values?

It is better to use AC. Impedance of the capacitor depends upon the frequency of the input signal. If we apply DC input signal than f = 0, that means Z approaches to infinity. If you apply the DC input signal then the current shall flow only for the time the capacitor is not charged. As the capacitor is charged current flow stops. At this point it is almost impossible to measure the voltage across capacitors because as you apply voltmeter across the capacitors, capacitors start to discharge through voltmeter (at this stage input impedance of the voltmeter is less as compared to that of capacitor).

So if you use AC then this situation does not occur, moreover you can control the impedance of the capacitor by varying the frequency of the input signal.

Regards

Muhammad Bilal Saif

If you have any further questions you can contact me at bilal_saif@giki.edu.pk

What are the applications of wireless communication?

mobile telephones

voice communications

wireless energy transfer

wireless data communications

cost effective

Why it is not correct to say that potential difference is the work done in moving unit charge between the point concerned?

Voltage is defined as potential difference (units of volts).

Work is equivalent to power (over time), and its' unit is joules. Power is equivalent to the potential difference times the current flow. Without current flow, there is no power, so it is incorrect to define potential difference as work.

What I think you're implying is potential energy and potential difference are the same:

Potential energy of a rock can be increased by raising the rock into the air. The increase of potential energy of the rock is equivalent to the real work done to raise it higher into the air. This is a true statement.

Potential energy (joules) and potential difference (volts) are not equivalent, though, since potential differenence is not defined as work.

What is the difference between a 54AS139 and a 74As139 integrated circuit?

The 54 series are military specification versions with a greater operating temperature range.

How is the Arduino board powered?

Most arduino models (including the Arduino Deumillanove and the older Arduino NG), can be powered with either a USB cable connected to a computer or with a 9v battery that is wired up to a 2.1mm barrel-tp male plug.

What is the explanation for the Operation of varicap diode?

The capacitance of a varicap diode varies as the reverse voltage to the diode changes. As you increase the reverse voltage, the capacitance decreases. And vice versa.

Will AC power tools run on a DC generator?

If the power tool has brushes to bring the current to the armature it is classed as an universal motor. It will run on DC as long as the voltage is the same potential. On a welding machine the 120 volt receptacle is a DC output and the grinders, drills, etc that are plugged into it work fine.

Can at89s52 replace at89c51?

can we replace AT89c51 by AT89s52 but i have c51 code

Who are the customers for nuclear measuring and control devices?

Most of the products shipped by the nuclear radiation detection and monitoring segment were shipped to the U.S. Department of Energy, U.S. Department of Defense, and nuclear power plants.

Can you make a photovoltaic cell at home?

Yes and no.

There used to be a hobby kit with all the materials (ceramic tube electric furnace, one bare silicon wafer, dopant chemicals, metal plating chemicals, wafer scoring scribe, wire, and chemical trays) and instructions to make 8 small silicon photovoltaic cells. But it has been out of production for more than 25 years.

It would be very difficult (but not completely impossible) to replicate something similar to this kit and make your own photovoltaic cells now, but certain materials would probably need to be purchased in prohibitively large quantity for an individual.

Why channel spacing is 200khz in gsm?

Simply because of the band-width required to transmit and receive calls. If the channel spacing was narrower - they'd need to reduce the band-width - which would reduce the amount of data they could transmit.

What are applications of electronic temperature transmitter and sensors?

applications:

anywhere you need to know a temperature

electronic advantages:

you wont have to crawl to an awkward spot to use a thermometer

Perhaps water temp while you drive your car

perhaps temperature inside the oven when you make a Pizza

disadvantages:

power is required

thermometer in grand pops medicine chest will work

new electronic one may have a dead battery after ten years even if never used

Can charge flow through ebonite rod?

No, ebonite is an insulator. Charges can reside on the surface but not flow through

How does the electronic siren works?

An electric siren is based on the principal of electrical energy and signals being converted into sound. Electrical inputs enter the a speaker through circuitry. In turn these signals are vibrate the air through the speakers function. Electrical sirens are in fact speakers, but there are mechanical sirens which use motion to drive the sound making assembly.

How do you erase a VHS tape?

you just tape over it. you do this by putting that VHS tape in and when a show or a commercial you want to watch comes on you just click on REC and it should erase the previous video on that that tape. Video tapes and most all types of magnetic media can be erased by exposing them to an AC field which is usually generated by hat's called, a `bulk eraser'. What it is, is a transformer with a switch, enclosed in some type of housing for convenience of use. If you look in the internet or Ebay, chances are that you can still find one, although they're not in a lot of demand today. The should be relatively inexpensive.

Advantage of RTL family?

1. advantages and disadvantages of RTL family?
2. merits and demerits of DTL family ?

What is Linear system in electronics?

A linear electronic device is one where output is linearly proportional, in some way, to input. An example is an amplifier. A non-linear device is one where the input drives the circuit into some kind of saturation mode. An example is a switch, such as is used in TTL IC's.

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