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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
The electrons come from the metal of the wire, light bulb filament, and plates inside the battery. In other words, they are already everywhere in the circuit, even before it is connected together.
The electrons are made to move (and thus do work, e.g. heating the filament to make light) by the electromotive force generated by the corrosion of the metal plates inside the battery by the electrolyte between those plates.
Note: while the electric current flows around the circuit at a speed close to the speed of light, individual electrons within that current actually move very slowly due to the fact they keep bouncing off atoms and other electrons thus performing a "random walk". These speeds are on the order of millimeters per hour.
What is the effect of varying frequency of the carrier signal on the AM wave?
spread spectrum , modulation or depending on the bandwidth poss FM (deviation)
The transformer size is calculated by using the load current that is required on the secondary side of the transformer. This secondary current is multiplied by the secondary voltage times 1.73. This total is then divided by 1000 to give you KVA. KVA = I x E x 1.73/1000.
How do theft detectors in stores sense unpaid items?
The most common way now is with a radio tag. It is a tag, sometimes hidden in the package, that sends out a weak signal. If the tag is not turned off at the checkout, it will be picked up by the reader at the front door, and the alarm will go off. When you purchase the item, the salesperson will drag it over a piece of equipment that neutralizes the tag. Sometimes you can hear a noise as it is done and sometimes it is silent.
A common misconception about anti-theft devices is that they are able to detect barcodes on stolen items. This is untrue. Unless the item has a magnetic or radio tag on it, the item will not be detected by the device.
he is one of welad el metnaka el sharamet el 7'awalat "koss omo ebn mtnaka ma3aras"
Which is the device that converts AC to DC?
A Rectifier converts Alternating current into Direct current
Does voltage flow across or through a resistor?
No. If a voltage is applied across a resistor, a current flows through it.
Two answers for this question. An electrical contact is any point in a circuit that a wire connects to, such as a screw or terminal block. The term is also used when referring to control circuits. There are contacts inside Relays, Ligthting contators, and motor starters. They can be called N.O. for normally open, and or N.C. for normally closed. They "Make" of "Break" and electrical circuit.
List three advantages an ATX system has over a Baby AT system?
adding and removing components easier, better support for I/O devises and processor technology, lowering costs.
What is the main truck used in transformers?
Bumblebee - Chevrolet Camaro (classic)
Autobot Jazz - Pontiac Solstice (Hard Top)
Autobot Ratchet - Hummer H2
Ironhide - GMC TopKick medium-duty truck
Optimus Prime - 1994 Peterbilt
What is the resistance value and tolerance of a resistor with Brown Green Red Silver?
15 k ohms with a 10% tolerance.
A voltage-free output, also known as a relay contact output or potential-free output, refers to a type of electrical output that does not carry any voltage or current until it is activated by an external circuit. It typically consists of a switch or relay that opens or closes under certain conditions, allowing the user to connect it to various devices without the risk of backfeeding voltage. This feature is commonly used in alarm systems, automation controls, and other applications where isolation from the power source is essential for safety and compatibility.
What is the total harmonic distortion of a Bose stereo system?
Harmonic distortion belongs to all amplifiers, loudspeakers and simply all electrical equipment you use. When it comes to audio, the only effect you will hear is a constant resonant low noise if the speakers aren't good at handling harmonic distortion. None of the Bose speakers I have tested so far produce that noise, so you don't have to worry about that.
Did Ray-O-Vac make vacuum tubes at one time as the title suggests?
I have a Ray-O-Vac RY22 tube. So yes, a company sold tubes under the Ray-O-Vac name. I don't know if this is the same company that makes batteries or who actually made the tube. A Google search didn't find anything and Tube Lore doesn't list Ray-O-Vac.
I also don't know much about this tube. It isn't an "industry standard" 22 since it is indirectly heated and has a 5 pin base. It looks like an old 24 with the S (globe or balloon) envelope.
Is adc present on chip in 8051 or not?
There is no formal adc input on the 8051. However, the CMOS version of the chip can use a technique involving a resistor, diode, and capacitor, along with a bidirectional pin (or one output pin and one input pin) to implement a "quick and dirty" adc function. You discharge the capacitor and then let it charge to the voltage of the input. You measure the time it takes to see the input pin change, and you calculate the input voltage.
40 A -providing the voltage remains constant.
Why transmit frequencies are allocated higher frequencies than that of receive frequencies?
That's not the case at all. A moment's thought will show you why that's impossible ... no 2-way link
could work if that were the rule.
Picture two communications sites talking to each other by radio over a "duplex" link ... meaning that
there's 2-way communication; each terminal can hear the other and talk to the other.
In order for them to communicate with each other, each receiver has to listen to the frequency where
the other end is transmitting.
If one site transmits HI and receives LO, then the opposite site had BETTER transmit LO and receive HI,
otherwise neither site can hear the other one !
It must be that exactly half of all the duplex terminals in the world transmit HI and receive LO,
and exactly the other half must transmit LO and receive HI.
