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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
Why the output voltage drop when the load current is increase?
As the load current increases the losses in the circuit increases (I2R loss) and speed of the generator decreases so the voltage falls a little. and this voltage fall can be adjusted by increasing the speed of the generator and Iron losses are taken as constant losses.
What is the number of significant figures in the number 0.07020?
4 significant figures. once put in scientific notation you will see 2.057 X 10^-2
You will ignore the last zero since it is to the farthest right past the decimal and not necessary.
Why does one bulb make the others go out in a series circuit?
because current in parellel divides unlike in series if one fails all will fails
AnswerThe parallel circuit's load current doesn't 'divide'. It's the other way around! Each branch draws an individual current which then 'combine' to form the circuit's load current. However, the reason that the remaining lamps connected in parallel always work, even if one fails, is because each branch of a parallel circuit is subjected to a common supply voltage.
What is a circuit board made of?
Plastic - it's a laminate that does not conduct electricity.
Nothing special.
What is the relationship between capacitors in series and resistors in series?
resistor isdefined as the opposing the current flow in a circuit. capacitor is defined as the store the electric field in one forth of the cycle and the another quarter cycle stored energy will be released
Do higher radio frequencies travel faster?
Electromagnetic waves in a vacuum move at the speed of light in a vacuum, as light is just one form of electromagnetic wave. According to Einstein's Theory of Relativity, nothing can move faster than the speed of light in a vacuum, so there is no way to speed up radio waves (unless they are initially moving in some other medium than a vacuum).
The total resistance is 5 ohms. Scroll down to related links and look at "Parallel Resistance Calculator".
How do you know electrical is grounded?
I test it with a digital multimeter. Set it to measure the voltage you're expecting, verify that the circuit is powered (put the red probe to the positive side of the circuit, and find a different ground), then move the black probe to the intended ground. You should be reading the voltage you're expecting if the ground is good.
What is difference between microprocesser and microcontroller?
An embedded system has historically been defined as a single function product where the intelligence is embedded in the system. It could be anything from a dishwasher to a hearing aid, if that product includes a microprocessor and software. Many of today's embedded systems are looking more like PCs with user interfaces, touchscreens, displays, keypads and more. Still, these are not general function systems but are designed to perform very specific functions. An embedded system makes use of embedded hardware (microprocessor) and embedded software to accomplish its purpose. Embedded software is generally comprised of: * Real-time operating system (RTOS) * Drivers (HW peripheral interface) * Application software
What are all the instruments in the world?
piano gutiar
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String Instruments:
Violin
Viola
Cello
Double Bass
Octobass
Vielle
Harp
Lyre
Guitar
Ukulele
Banjo
Lute
Piano
Harpischord
Mandolin
Shamisen
Sitar
Woodwind Instruments:
Flute
Piccolo
Pan flute
Fife
Ocarina
Recorder
Clarinet
Bass Clarinet
Saxophone
Bassoon
Oboe
Bagpipes
Brass Instruments:
Trumpet
Trombone
Tuba
French Horn
Baritone
Bugle
Euphonium
Sousaphone
Percussion Instruments:
Drum Kit
Bass Drum
Bongo Drum
Conga Drum
Snare Drum
Cymbals
Glockenspiel (best word ever!)
Hand Bells
Maracas
Sleigh Bells/Jingle Bells
Timpani
Tamborine
Xylophone
Misc.:
Accordion
Harmonica
Pipe Organ
Digeridoo
Vuvuzela
Synthesizer
Keytar
There are other native cultural instruments, but these are the most "worldly" used that I could think of. Note that many of these instruments have different types as well, such as alto sax and tenor sax for saxophone.
thermistors change value as thermal units increases or decreases . that can be used to shut down items that unnecessarily overheat
Can 60hertz transformer use at 50hertz power?
As long as they're the same voltage, yes it will, but probably not for long. A lot depends on what type of appliance you're using. For instance, if it's an electric stove, you'd probably be OK, but if it has a clock, expect it to run slow. And even that too, dependfs on what type of electric stove it is. The problem is that at the lower frequency, the device has to draw more power in able to do the same amount of work that it would at 60 Hz. Because of that, some motors, electronically controlled devices and the like, tend to overheat as a result. For a window fan, it's probably no big problem (although I'd keep an eye on it until I knew for sure) but for something that's `frequency dependent', like a refrigerator compressor, I'd think you'd just be asking for problems. Usually during the day, voltages and frequency of the U.S. system varies in both frequency and voltage. A `brown-out' usually happens when the voltage falls below 80 volts, as compared to the nominal 117 volts. But too, so does the frequency. Tis is mainly because of industrial usage during the day, along with air conditioners and the like. Late at night though, it's usually closest to where it's supposed to be. Does it work? Will it work? Yes. The question is: For how long.
What is no load current in transformer?
I'm not sure that it is correct to say a transformer limits current under no load (maybe it is, depending on your application).
A step down transformer converts a high voltage at the primary to a lower voltage at the secondary. Under no load conditions, the secondary will be an open circuit. Since The primary current relative to the secondary current will be Np/Ns (the turns ratio, primary to secondary), and the primary voltage relative to the secondary is Ns/Np, the apparent resistance at the primary due to an open at the secondary will be (Np/Ns)^2*(open circuit). Since an open circuit is typically approximated as an infinite resistance, resistance is infinite. The turns ratio in this idealized example doesn't really matter, hence the transformer doesn't really matter (only the fact that a no load means an open secondary matters).
What is the Frequency response of common emitter amplifier?
The voltage gain is a measure of the amplified output available at the collector terminal divided by the voltage measured on the base. This if you have 10 mV applied to the base and voltage of 1 volt at the collector the voltage gain is 100
ANSWERThe maximum voltage gain of a common emitter amplifier is dependant on the transistor itself. Some have only a very small voltage gain such as in Radio Frequency Power transistors. These are almost all used as common emitter circuits for bipolar transistors or common source for FETs.. On the other hand some darlington transistors can have common emitter gains of hundreds of thousands.If the stage has an unbypassed emitter resistor, the voltage gain is equal to Rload/RE, (Rload is the parallel value of the resistance from collector to the supply and the resistance of the load).
If the emitter resistance is bypassed, the value of resistance to be used for RE is the internal Re which is equal to 25mV/Ie
Difference between 8051 and 8751 micro controllers?
There are many differences between the 8085 and the 8086/8088. Naming just a few...
- 8085 is an 8 bit processor, while 8086 is a 16 bit processor
- 8085 has a 16 bit address bus, while 8086 has a 20 bit address bus
- 8085 has an 8 bit data bus
- 8088 has an 8 bit data bus
- 8086 has a 16 bit data bus
- 8086 has a segmented architecture to support the 20 bit address bus
- 8086 has additional registers that support string and repeated loop instructions
- 8086 has addition register that support stack frame parameter addressing
- 8086 has more addressing modes, including cross-segment modes
- 8086 has more types of interrupts, including debug single-step
- 8086 has true multiplication and division instructions
If anyone has any more examples, please fee free to add to the list.
What?
In May 28, 1946, a survey conducted by Bell Labs offered “a discussion of some proposed names”
Among them was "transconductance/transfer varistor".
So the question repeats the common mistake that it was "transfer resistor".
How does a submersible water pump work in a well?
A submersible pump is normally fitted with a float switch. As the water rises, the float switch turns the pump on. When the pump empties the water from the level and the level falls again, the float switch turns the pump off again.
FM signals travel as what changes?
FM signals travel as changes in the frequency of the wave.
ANSWER: DEFINITELY not frequency remains the same.The duty cycle changes.
It definitely IS the the frequency which changes. It changes at the same rate as the frequency of the modulation.
It can be demodulated with a frequency discriminator. If the frequency remained constant and its "duty cycle" changed, the discriminator wouldn't demodulate it.
How many valence electrons are there in doped materials of p-type and n-type materials?
1. N and P-type Semiconductors
Neither pure silicon(Si) nor germanium(Ge) are great conductors. They form a crystal
lattice by having each atom share all of its 4 valence electrons with neighbouring atoms.
The total of eight electrons can not easily be jiggled out of place by an incoming current.
If , however, the crystalline array is "doped"(mixed with an impurity) with arsenic which
has five valence electrons, the behaviour of the lattice will change. Four bonds will be
still be made but there will be a leftover electron that can wander through the crystal.
This is called an n-type semiconductor.
Boron can also be used to dope a pure crystal of silicon. But since boron only offers 3 of
the four electrons that a silicon atom needs, each silicon center is left with a hole.
Semiconductors made in this manner are called p-type.
In a p-type material if an atom from a neighbouring atom fills the hole, it will leave a
hole adjacent to it. This process will continue in a domino effect and the hole will be
moving in the direction opposite to electron-flow. In reality the atoms are remaining fixed
in the lattice, but there is an illusion that the holes are physically moving.
How is The range of an voltmeter is increased?
The easiest way is to put a high resistance in series with the meter.
You must know the input resistance of the meter. This is specified in the owner manual.
Some meters are specified as having a certain input resistance.
If a meter has a 1 Megohm input resistance, you can scale it up by a factor of ten by putting a 9 Megohm resistor in series with one of the probes.
Some meters are specified in "ohms per volt".
The Ohms/V rating can be different on different scales. If a meter is specified on the 600 volt scale as having "20,000 Ohms per Volt", then this means that the meter's resistance is 20,000 * 600, = 12,000,000 Ohms. 12 Megohms.
To expand the meter's 600V scale to 10X the rating (6,000 volts), you would put a 108 megohm resistance in series with the probe. This resistance could be made up of ten 10 Megohm resistors, a 7.5 megohm resistor, and a 470 Ohm resistor. Even though that is only 107.97 megohms, the error is less than 1%.
To expand the scale to 2X (1,200V) you would put a 12 megohm resistance in series with the probe.
High voltage low power resistor strings can be put inside plastic, glass, or ceramic pipes. Consult the appropriate industry publications for recommendations.
warning:
Be careful when measuring high voltages. Never work alone.
Most simple resistors are not rated for high voltage over 200-500 volts per each resistor and will arc or burn. Injury or death may result.
I prefer to hook the "hot" end of the probe to the high voltage test point and let it hang there, and not to hold it by hand. Then I energize the equipment and take the readings. After I am done, I discharge the high voltage and safely remove the probe from the equipment.
Poorly made or defective probes have killed people.
What are the parts in a diode?
That depends on the diode, however I will talk about a very basic one. Simple version: One side is called the anode, the other is the cathode. Current only flows from the anode to toward the cathode. It is blocked from traveling in the other direction. Less simple version: I am including this since you asked about the parts "in" a diode and not the parts "of" a diode. Diodes are semiconductor devices and are constructed with two pieces of semiconductor material (silicon, germanium, etc), one of which has been designed with extra electrons in it (cathode side) and one with extra spots for electrons to occupy (anode side) . Remember current flowing in one direction means electrons are traveling in the opposite direction. Now, if you apply enough positive voltage to the cathode, current will flow to the anode, but it will damage the diode if it is not designed to handle it. Some diodes are even designed to be used this way (look up zener diodes). To really understand the physics of what is happening in these materials, you need some knowledge of quantum mechanics (not joking) but that is beyond this question. Hope you got what you needed.
What is handshake in computer language?
A computer handshake is basically this: its a term used to describe the process of one computer establishing a connection with another computer or device. The handshake is often the steps of verifying the connection, the speed, and/or the authorization of the computer trying to connect to it. An example of handshaking is when a modem connects to another modem; the tones heard after the dialing is the handshake and can be thought of as the computers greeting each other.
Think of it as literally a handshake between two people, or two dogs in a park sniffing each others....You know. If the "Handshake is successful: BAM! protocol (computer communication language) is established and life is good.
Protocol (BTW) can be physical (USB, Cables etc) or wireless (on the internet) via packets which are.............
A Packet is a series of bits transmitted or received by a computer. Internet traffic is routed and controlled in packet-form.
What enables the electric current to move through a material?
The electric current moves in the direction opposite to the flow of electrons by convention.When a potential difference is applied to a material which has "loose" electrons, the electrons move in a direction opposite to the potential gradient and the current moves in the opposite direction to the flow of electrons.This is how current flows in materials.
