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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 is maintenance in telecoms equipment?
Is to check periodiccaly,I am guessing. I suggest you check out the link i have attached for your reference.
How does MSSPRing works in SDH?
what are the bennefits of sdh? what are the bennefits of sdh? what are the bennefits of sdh? what are the bennefits of sdh? what are the bennefits of sdh?
When was the first transistor created?
1947 at Bell Labs. It was a germanium point contact transistor.
When we look at transformers, we'll generally see that watts in will equal watts out. Said another way, volt-amps in equal volt-amps out. There is a simple relationship between the turns ratio between the primary and secondary and the voltages between those two windings. From there, it's a hop, skip and a jump to figuring out currents. In a one to one transformer, volts in equal volts out. Current in will equal current out, too. Watts in will equal watts out. In a step down transformer with, say, a 10:1 ratio, 120 volts in will produce 12 volts out. And a 1 amp secondary current will appear as a 0.1 amp current in the primary. The 120 volts x 0.1 amps = 12 watts. And the 12 volts x 1 amp = 12 watts. Volt amps in equals volt-amps out, and power in equals power out. Simple and easy. If you are using a step up transformer in, say, a 110 volt to 220 volt application, 110 watts in the primary at the 110 volts will be 1 amp. In the secondary side, 220 volts will appear and 0.5 amps will be the current flow. The 220 volts times the 0.5 amps is 110 watts, as asked about. The secondary has twice the voltage and half the current of the primary side. There are 110 watts in and 110 watts out. Again, simple and easy.
What is the baud rate for a signal that has 1800 bps and 3 bits per signal unit?
600 bauds per second
The of an antenna depends upon the frequency of the RF signal and the gain?
The size of an antenna depends upon the frequecny of the RF signal and the gain.
What is frequency range of amplitude moulation radio?
Any radio signal, regardless of its frequency, can be amplitude-modulated in order to
add information to it.
In the US, commercial broadcast AM radio stations operate on carrier frequencies
between 540 KHz and 1.7 MHz.
BPL modems use silicon chipsets specially designed to handle the work load of pulling data out of an electric current. Using specially developed modulation techniques and adaptive algorithms, BPL modems are capable of handling powerline noise on a wide spectrum.
[quote]http://static.howstuffworks.com/gif/bpl-modem.gif[/quote]
The BPL modem simply plugs into the wall and then into your computer. These modems are capable of speeds comparable to DSL or cable modems.
A BPL modem is plug and play and is roughly the size of a common power adapter. It plugs into a common wall socket, and an Ethernet cable running to your computer finishes the connection. Wireless versions are also available. While the potential of this new technology is exciting, not everyone is excited about it. In the next section, we'll discuss some of the challenges confronting the implementation of BPL.
On April 23, 2003, the FCC put forth a Notice of Inquiry to the public supporting the potential of the BPL technology and seeking to set standards in practice for its implementation. Immediate opposition came from the American Radio Relay League (ARRL) and the Federal Emergency Management Agency (FEMA). Both entities claim that BPL will cause serious interference issues. A BPL modem is considered an unlicensed device, like a cordless phone or garage door opener. All unlicensed devices are governed by the FCC's Part 15 rules. Part 15 mandates that all electronic devices sold in the United States must meet FCC radio-frequency emissions limits. These limits are in place to secure against interference with important transmissions like CB communications, air-traffic control and government channels. ARRL and FEMA are concerned about the interference caused by BPL signals transmitted on exposed medium-voltage power lines. Cable TV operators get around the interference problem by shielding all of their cables. "Coaxial cable" used by cable TV operators has a braided metal shield that surrounds the signal wire. Telephone cables are also shielded. Power lines, on the other hand, have no shielding. In many cases, a power line is a bare wire, or a wire coated in plastic. The lack of shielding is where the interference concern comes from. Depending on the bandwidth the FCC allots for BPL, interference with other radio services may be a problem. Currently, the frequency band breaks down as follows:
[quote]http://static.howstuffworks.com/gif/radio-spectrum.gif[/quote] * AM radio - 535 kilohertz to 1.7 megahertz * Short-wave radio - 5.9 megahertz to 26.1 megahertz * Citizens-band (CB) radio - 26.96 megahertz to 27.41 megahertz * Television stations - 54 to 88 megahertz for channels 2 through 6 * FM radio - 88 megahertz to 108 megahertz * Television stations - 174 to 220 megahertz for channels 7 through 13 While FEMA is wiling to allow the FCC to seek a compromise, the ARRL claims that compromise is not possible because the bandwidth needed for BPL will directly interfere with ham radio and short-wave radio transmissions. Developers of BPL say that these interference issues have been solved. Only tests and time will tell. Until then, the advancement of BPL moves forward slowly as it waits for standards and logistics to be decided by regulating bodies. For more information on BPL, other Internet connection methods, and related topics, check out the links on the next page.
If 3 resistors of 56 12 and 33 ohms are in parallel what is there combined resistance?
The combined resistance is 7.6049 ohms.
What ohms am i running if i have two 4 ohm speakers hooked up to my amp vs two 2 ohm speakers?
Don't know how you have subs wired but should be 4 ohm load is what your amp will see.
Potential difference is measured in a unit called 1 a volt 2 a Watt 3 an Ampere 4 an ohm?
The answer is volt.
An LED. (el-ee-dee)
You would put 'an' before the word LED because the letter L is pronounced with a leading vowel sound, as "EL". It is not a vowel that determines the usage, but the vowel sound. Similarly, the silent H in "hour" means that 1 hour is "an hour".
The reverse is found in words such "union", where the YOU sounds like a consonant, and you say "a union."
Sounded-out acronyms
When an acronym is sounded out as a word, rather than individual letters, then it can use the article matching the word sound, as with a NASA probe or a NORAD radar station.
What is the function a transducer?
Transducer is a device which converts one quantity in to another quantity........... Mostly we are using electrical transducers. That converts physical quantity in to electrical quantity.
Transducers enables us to measure the physical quantity. Also they are employed in the sensors too.
Something that will not let electricity flow through it?
Something that does not allow current to flow is called an insulator.
"Electricity" doesn't flow, only current, which is one aspect of electricity, does.
Note, current is the flow of electrons.
If voltage equals resistance x current then?
Ohm's Law: Voltage equals Resistance times Current Given any two, you can figure out the other using simple algebra.
How do Impressed Current anodes work?
i dont know
use rectifier just invert ac to dc and supplied to anodes positive to steel negative
Which has greater resistance to transmission errors Binary signaling or Analog signaling?
digital signals (usually binary coded) can include extra information that can be used for error detection or even correction. this allows recovery of the original signal, either by requesting retransmission or by directly correcting the error.
analog signals can't include any extra information needed for this purpose. it is impossible to distinguish an error from the original data.
How can a technician identify a wire wound resistor that is color coded?
The same way he/she can identify a composite resistor that is color coded or a metal film resistor that is color coded: by reading the color code bands. They all use the same color code.
If for some reason the color bands are damaged and unreadable, the resistor will have to be removed and measured with a meter. However this reading may be incorrect as whatever caused the color bands to become unreadable may have also damaged the resistor, changing its value. Verify the value on the schematic!
Most household batteries don't provide enough voltage difference for you to feel. For example, holding a "C" cell battery with a finger on each terminal is only 1.5 volts, and your skin provides enough resistance so that no current will flow through your body.
If you moisten your finger and touch both terminals of a 9-volt battery, you may feel a little tingle in your finger.
DO NOT touch the terminals of a 12-volt car battery; you could be injured or killed. At the very least, it would knock you on your butt.
What is the difference between pir movement sensor and ir sensor?
Passive simply means that the unit does not emit IR light, but does detect it. All warm things emit some degree of IR. a PIR motion detector senses the difference between a warm body and the cold background.
Active IR emits IR light to illuminate an area to be "seen" with it's CCD that is sensitive to IR. Most new Sony camcorders use active IR for "night vision".
IR alone, with no modifier, simply refers to the spectrum of light known as Infra Red, which is slightly above human's vision range.
Is lithographic and offset printing the same?
yes, absolutely same... cuma offset lebih kepada proses pemindahan imej. manakala kaedah kerja cetakan tersebut dipanggil litografik (lithography)
Micro-Electro-Mechanical Systems (MEMS) is the integration of mechanical elements, sensors, actuators, and electronics on a common silicon substrate through microfabrication technology
