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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 the difference between resistance and resistor?

Resistance is the property of a conductor, which determines the quantity of current that passes through it when a potential difference is applied across it.

A resistor is a electrical componet with a predetermined electrical resistance, like 1 ohm, 10 ohms 100 ohms 10000 ohms etc..

depending on how much current you want to pass through a circuit, you would design the circuit with the required resistors

Does an open resistor measure 0 ohms?

No, an open resistor has a value of infinity. An open resistor typically will measure over 900 Megohms. A zero ohm resistor is exactly that, and will measure zero ohms. They are typically surface-mount devices.

Does motional emf call induced emf?

yes indused emf is also called motional emf.

If an open coil is subjected to a variable magnetic field, at the ends of the coil a potential difference is induced which is called induced emf.

If a coil is connected to an emf source and switched on, the rising current will produced an variable magnetic field which in turn produces an emf. It is called back emf.

Why ordinary silicon diodes do not emit light?

  1. Silicon is opaque to all light (IR through UV).
  2. The bandgap of silicon is not high enough to produce visible photons, only IR photons.

How many volts can a capacitor hold. what would be the formula for a capacitor that holds 100 volts?

The working voltage of a capacitor depends on the nature of the dielectric and its thickness. Most capacitors are marked on the case e.g. 500V wkg. or just 150V. Small components are colour coded; the code will tell you the capacitance, and the wkg voltage.

What is meant by IC?

An integrated circuit or monolithic integrated circuit (also referred to as an IC, a chip, or a microchip) is an electronic circuit on one small plate ("chip") of semiconductor material, normally silicon. Such a circuit can be made very compact, having up to several billion transistors and other electronic components. The width of each conductor (the line width) can be made smaller and smaller as the technology advances, and can now (in 2012) be expressed as a two-digit number of nanometers.

When ac generators are operated in parallel frequency and voltage must be equal or frequency and voltage must equal amperage?

This question is worded awkwardly, but, the answer would be, They must be of equal Voltage (primarily) and equal frequency. If they were of different voltages, one would feed the other. The amperages can be different.

If these generators were going into a distribution unit, the DU would have to have a frequency matcher, and would also force the output voltage to meet the load voltage (in the case of minor voltage deviations).

Can you rephrase this question into several smaller questions? I'll help you out as much as I can from there, and go to "MY Bio Page" and ask other more detailed questions.

What is amplitude distortion?

Amplitude distortion occurs in an electronic signal when the power of the amplifier is not great enough to carry the sine wave to its intended peak amplification. If you look at the wave form of a amplitude distorted output signal, it would look like someone had neatly sliced off the top of a hill. Though amplitude distortion is usually an undesired result, the effect is sometimes used intentionally for audio applications, such as a distorted rock guitar which gives that crunchy rock sound.

What color are capacitors on a motherboard?

red (rare), metallic green, blue, light blue, brown, lime green, yellow, silver, black, gray, purple (rare).

How do you check MOSFET transistor using analoge multitester?

A VOM will never do it. A curve tracer Will check all the parameters. Actually that goes for any other component you want to test.

What is the electric current voltage in Egypt?

220V single phase (domestic)
380V three phase (industrial)

AnswerThe voltage in Egypt is 220 V @ 50 Hz, compatible with most of Western Europe, but not with the US and Canada (which also have different plugs).

Will 6 ohm speakers work with 8 ohm amp?

There are no 8 ohm amplifiers!

The amplifier will have an output impedance of around 0.08 ohms. In hi-fi we have always impedance bridging. Zout << Zin. That means that the output impedance of the amplifier is much less than the impedance of the loud speaker.

The damping factor Df = Zin / Zout tells you what Zout is.

Zout = Zin/Df.

If the damping factor Df = 200 and the loudspeaker impedance is Zin = 8 ohms, the output impedance of the amplifier is Zout = 8 / 200 = 0.04 ohms.

You see, there is no "8 ohm amplifier" with a 8 ohm output.

Scroll down to related links and look at "Voltage Bridging - Zout < Zin".

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6 ohm 'speakers will work with amplifiers which are designed for an 8 ohm load.

However, you run a risk of overloading the amplifier since it will be called upon to supply more current into the load than it would with the correct one.

What economical device - varistor - transistor etc can you use to supply power to a relay until the voltage drops to 10.5 volts?

A zener diode, a transistor, a rectifier diode, and a few resistors. A 10.5V zener diode will conduct until the voltage across it drops to below 10.5. If the relay is small enough, a zener diode is all you need. However, more than likely the current draw of the coil would burn the zener out. Use the zener to drive a transistor, and use the transistor to trigger the relay. V+ | |_______________________ | | _|_| _____|___ |/ \ 10.5V | | /___\ | 3 Relay | __|__ 3 Coil | / \ 3 0---------- /___\ 3 | | | 3 \ \ 4.7K | | / 2.2K / |____ ___| \ \ | / / | | | B | / C | |________|/ | |\ 2N2222 | | \ | | E |______________________| | _|_ \\\ When the voltage is above 10.5V the zener will conduct ant turn on the transistor. The transistor will power the relay. When the voltage drops below 10.5V the zener will stop conducting, shutting off the relay. The rectifier diode absorbs transients caused by the field breakdown in the coil, protecting the transistor. Just a plain resistor will do it or you may follows suggestion and use a computer to do that. The last time i used those ancient devices i find out they operate as a current device like minimum pull in current source. So a passive resistor in series will insure the minimum pull in source however it could be higher then the 10.5 v you need.The above designi just plain silly.

How do you change the hall effect switch in a 93 cadillac deville 4.9L?

It is magnetic pick-up in the bottom of distributor. If car has alot of miles on engine, best to get a rebuilt distibutor. Otherwise, use a technition to replace pick-up. Have to disassmble distibutor to access pick-up.

What is a parallel circuit?

A parallel circuit is one which the current passes through the electrical devices in separate paths.

For example, consider 2 resistors (loads):

  • If the current must pass through one resistor to get to the other one, then it is a series circuit.
  • If the current path splits so that the current can pass through each resistor independently, then it is a parallel circuit.

A practical example

In a house each lamp and its light switch are wired in series with each other but all the separate circuits feeding the lights in a house are wired in parallel with each other because any one light can be either on or off independently of the others.


if one light burns out the others wll still light
A parallel circuit is one in which two or more circuit elements are connected in parallel, for example, two light switches wired so that either switch will turn on the light, or two bulbs wired together so that one swirch turns them both on. More info: http://www.allaboutcircuits.com/vol_1/chpt_5/1.html
What are "series" and "parallel" circuits?
a parallel circut is when their are items parallel to eachother. like for example making a simple electrical circut.

a parallel circuit is when electricity flows through more than one pathway

Can you list two reasons that modulation is used for communications transmissions?

To send multiple messages by changing the carrier signal.

To be able to use smaller antennas higher frequency means smaller antenna

What is the voltage drop running through the parallel potion of the circuit?

A: There is no voltage drop running through in a parallel circuit but rather the voltage drop across each branch of a parallel circuit is the same

Where can someone buy 4 channel amplifier?

One can purchase a 4 channel amplifier from any local music supply store as well as some local department stores. One can also purchase these from online retailers such as Amazon.

What are the uses of silicon oxide in a mobile phone?

As in all modern electronic devices, a microscopically thin layer of silicon dioxide is grown as an insulator and passivator over the silicon of integrated circuits and discrete transistors. This process was developed in 1959 by Fairchild Semiconductor for use in their Planar Process for making silicon transistors and immediately spread throughout the industry, permitting use of inexpensive plastic packaging for semiconductor devices for the first time.

Silicon oxide polymers are also in the silicone rubber parts that seal the case and keyboard from moisture.