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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
Can you use phones from another country?
In this answer, "phones" means "wired telephones", as opposed to wireless (cell) phones. (See below for information about mobile phones.)
Generally yes, but the ringing or volume may be wrong. Some countries have laws about exactly what specifications a phone must have in order to be connected to the phone system.
I have experience with Belgian electronic and Russian non-electronic phones connected in the USA. They both worked, but the ringing was very harsh on both, and the Belgian phone's volume was much too loud and it would feedback at times.
These differences occur because of the voltages used by the phone system to operate the phones are different around the globe. This is to clarify: The phone gets its power to ring and to comunicate from the phone line.
In the USA, which uses generally higher ringing and line voltages, you might be able to tweak your phone to operate perfectly by placing a resistor in series with the ringer and a resistor in series with each line (is always a pair) to the speech network inside the phone, if the ringing or speech is too loud. I did not try this, I just stopped using the out-of-country phones.
For a mobile phone (cell phone), you can use a phone from another country if it uses a compatible frequency band. Many mobile handsets are "dual-band" or "multi-band," allowing them to be used in more countries. If you are planning to travel abroad with a mobile phone, check with your mobile service provider (cellular company) before you leave to see whether your phone will work in the country you will be visiting, and what the roaming rates will be. Alternatively, if your mobile uses a SIM card, you may be able to plug your SIM card into a handset that operates on the appropriate frequency band. It is possible to rent a handset for that purpose.
What are the practical applications of maximum power transfer theorem?
I don't see the use of, without a purpose, deliberately seeking a lower power output than possible -- why would you waste energy?
If the purpose is to control power, then the maximum power transfer theorem will predict what can possibly be delivered by the system. The theorem is telling you the design is less than ideal if you measure something less, which is always true. You can ask yourself "Can I possibly improve the design?"
Differentiate between alternating current and direct current In points?
AC and DC can be differentiated but not in points.
The simple answer is that it isn't! Ohm's Law applies to so few conductors and electrical devices that it hardly qualifies as a 'law' at all. For Ohm's Law to apply, the ratio of the voltage across a conductor (or any sort of load) to the current through that conductor must be constant for variations in voltage, and this occurs in very few conductors.
Many people, who should know better, mistakenly believe that the equation, R = V/I, represents Ohm's Law. This is incorrect, as the equation is derived from the definition of the ohm (being defined as a 'volt per ampere'), and not from Ohm's Law. This equation is universal, and applies in situations where Ohm's Law doesn't. For example, the ratio of voltage to current for a tungsten lamp changes as the voltage across the filament changes and, so, tungsten doesn't obey Ohm's Law. However, for any particular voltage, the resistance of tungsten AT THAT VOLTAGE can be determined by the equation.
Many scientists and engineers believe that Ohm's Law should be a law at all. A well-known MIT professor, for example, goes as far as to say that "Ohm's Law is a fake"! In my opinion, there doesn't seem to be any good argument for teaching Ohm's Law beyond its historical significance.
Where can you find a replacement for a transistor number umt3584?
Check this place. Others do exist offering such a component. www.cmbcomp.com/p/l35.htm Good luck.
Voltage on primary/Primary turns = Voltage on secondary/Secondary turns
What device is needed for current to flow in an electric circuit?
Too vague of a question. As long as it is a closed circuit it will flow.
Are capacitors interchangeable?
Yes and no. In order for it to work electrically then your replacement part has to have the same or higher voltage rating, The same value rating is also important (micro farads). And it has to be the same type either AC or DC. A lot of DC capacitors are polarity sensitive and will only successfully work when hooked up in the same polarity. Also keeping the same type of chemistry is important. If the Original type is Electrolytic, Tantalum, Mylar, Silver Mica and so on then pick a replacement part that is the same chemistry as the original. In some applications if you're replacing an existing part with a new one you may have to choose a part that will physically fit and attach in the same way the original part did.
a fixed pulley is a pulley that stays at one place to pick up an object. A clothes hanger is a fixed pulley.....this is all i know
good luck...
How do you check kbpc2510 bridge rectifier?
The KBPC2510 is a silicon bridge rectifier rated 25 amps forward and 1000 volts reverse. To test it, you need an ohmmeter that has at least 2.4 volts of open circuit voltage.
Take the bridge out of the circuit.
Start by checking from AC terminal to the other AC terminal. (Two tests.) There should be no conductivity in either direction.
Now check from DC terminal to the other DC terminal. (Two tests.) You should get conductivity when the meter's plus lead is on the minus output (anode) and no conductivity the other way. When you get conductivity, it should not appear as zero ohms.
Now check from each AC terminal to each DC terminal. (Eight tests.) You should get conductivity when the meter's plus lead is on the minus output (anode) or the meter's minus lead is on the plus output (cathode). This conductivity will appear to have less resistance than the prior test, but it should still not be zero ohms. Again, there should be no conductivity when the leads are reversed.
In all, you are making 12 measurements, two across each diode, and two across opposite corners of the bridge.
This is only a low current test. In all probability, if the bridge passes this, it is OK. If you want a higher current test, you could do various things, but all of them involve risk of electrocution and/or damage.
CAUTION: USE PROTECTIVE MEASURES TO PREVENT ELECTROCUTION AND/OR DAMAGE TO THE BRIDGE OR EQUIPMENT. USE APPROPRIATE CLIP ON TEST LEADS AND DO NOT TOUCH ANYTHING WHEN THE POWER IS ON.
You could wire a 120VAC source to a bulb, say of 150 watts. Complete the circuit, one at a time, to each of the 6 combinations through the bridge. If the bulb glows brightly in any one path, that path is shorted. If it glows at quarter power (half current), that path is normal. If it does not glow, that path is open. (Remember: The path from AC to AC should appear open - all other paths should appear normal.) Note that this test is only using one and a quarter amps.
Why is a light bulb a resistor?
Most simple incandescent light bulbs are made of a thin section of tungsten through which the current flows.
This section of tungsten is called a "filament".
The tungsten filament has electrical resistance and so is a resistor.
As a resistor it develops a voltage drop. This voltage drop multiplied by the amperage passing through it equals the wattage of the bulb.
The heated tungsten gets to thousands of degrees above room temperature and becomes hot enough to produce yellow-white visible light.
As a resistor, the tungsten light bulb has a positive resistance coefficient.
This means that the electrical resistance goes up when the filament becomes hot.
For example, a 100 watt light bulb operated at 120 volts - it does not matter if it is AC or DC for this calculation - will have a resistance of 144 ohms when hot and draw .833 ampere.
When cold the filament typically has a resistance of only 10 ohms which increases as the filament heats up.
An interesting note:
The typical incandescent light bulb life is between 1000 and 2000 hours.
Some "long life" incandescent light bulbs simply have a thicker but longer section of tungsten and can run 5,000 to 20,000 hours or more without failing.
This type of bulb is sold to hotels and other places that want to reduce the replacement frequency of the bulbs.
If a manufacturer desired to do so they could make a light bulb which would last even longer than 20,000 hours by increasing the filament thickness but they feel that economically it would not be desirable for them, as they would sell less light bulbs.
Function block diagram of the digital multimeter?
A digital multi meter is what is used to find electric current. A block diagram shows all of the working parts of the multi meter and how they are connected.
it decreases...............
What happens to a bulb when you move it to the battery on a circuit?
It doesn't matter where the bulb is in respect to the battery, as long as the circuit is complete, the bulb will light up.
What is the effect of a leaky capacitor filter on the output of a full-wave bridge rectifier?
A: The leakage is an additional load to the bridge effect is that the capacitor will get hot then hotter because of it leaks more eventually blows hopefully open or dead short. both of these scenario may save the power supply.
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What is the difference between parallel and series circuits?
A series circuit is one in which the current must pass through all the electrical devices in the circuit in turn.
A parallel circuit is one in which the current passes through each electrical device on the circuit following separate, independent path from all other devices on the circuit, one for each electrical device.
How does an electric current flow?
The very word current means 'flow'. Electric current is the flow of electric charges. There are two kind of electric charges. Scientists considered the electric current as the flow of positive charges. But in case of solid metals, only negatively charged electrons are able to move freely where as the positively charged protons are held firmly within the core of the atoms. So electric current is due to negatively charged electrons. Now we have to differentiate these two. How? Let us consider the current due to flow of positive charges as conventional current flow. Hence conventional current direction is always opposite to the direction of flow of electrons. To keep the charges in motion we need a force to push them. So we use a chemical cell which has electrical potential difference between the two terminals. This potential difference is named as " electro motive force", in short "emf". So emf is responsible to make electric charges to flow.
Get enough photons into "population inversion" as you can between two mirrors an it will lase. One mirror must allow some light out to work. Population inversion caused by pumping the cavity with light or electrons.
Why the speed of electron beam is greater than the light speed in cathode ray oscilloscope?
Why is the speed of the electron beam greater than the speed of light in cathode ray oscilloscope.
