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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 an inductor and a capacitor?
Firstly the suffix '-ance' in each of those three words indicate the properties the material exhibits.
Therefore resistance is the property by which any material tends to oppose the flow of current through it.
Inductance is the property by which a material opposes the change in current, or opposes an alternating current. An inductor can be appreciated simply using a coil of insulated wire, or a solenoid.
Capacitance is the property by which a material opposes the change in voltage across its ends, ie how it opposes alternating voltage. A capacitor comprises of, essentially, two metallic plates separated by a dielectric (a medium which may/may not be non-conducting, but is capable to contain charge).
cheers!!
How does a moving coil microphone work?
A moving coil microphone is used for a variety of audio applications primarily for recording and sound reinforcement. It can be used in a wide range of situations from professional recording studios to live performances and is the most common type of microphone in use today. Its versatility and reliability make it a great choice for many different applications.
- Recording: Moving coil microphones are used to capture audio in the studio such as vocal and instrumental performances spoken audio and sound effects.
- Live sound reinforcement: Moving coil microphones can be used in live sound reinforcement situations such as concerts theater performances and public speaking events.
- Broadcast: Moving coil microphones are used in broadcasting applications such as radio and television.
Moving coil microphones offer a number of advantages including high sensitivity low self-noise and low distortion. They are also relatively inexpensive and easy to use making them a popular choice for many different audio applications.
Advantages of Frequency Division Multiplexing?
FDM is the technique used to shift several base band signals to different higher frequencies, thus creating, in effect, a larger channel bandwidth because several signals can be sent over the same medium at the same time without interference with each other.
What things use series circuits?
Christmas tree lights.
LIGHTS for Christmas do not need to in series but conveniently in series saves power.
A regulator while usually is in series does not be in series to regulate. FINALLY everything eventually are connected in series. from 475kv transmission to the local home device.
How do you increase a voltage?
If you are dealing with AC voltage, you can use a transformer. You can find transformers at places like Radio Shack, Jaycar and some online sites like eBay. Transformers have to be connected in the right way. You have to connect the voltage you are going to increase to the low voltage side and on the high voltage side will be the voltage which has been stepped up by the transformer. (If you want a DC voltage out, you will need to connect a bridge rectifier to the output, followed by a large capacitor and then a voltage regulator of the voltage you want out.)
If you are dealing with DC voltage then you will need a chip to step the voltage up. These chips can step voltage up from around 1 to 10 volts to at least 20 to 30 volts. These chips also need to be connected correctly. You will need more components than using a transformer. You will probably need some capacitors and some resistors. Depending on the IC you choose, you will find many circuits on Google for it and how to build them.
By far the easiest type of voltage to step up is AC. If you have the option of AC, and need to have a very high voltage output, you are better off using a transformer, bridge rectifier and a rectifier.
How transistor produce 180 degree phase shift?
In the common emitter configuration, a class A amplifier, an increase in base voltage (the input) leads to an increase in base-emitter current which leads to a proportionately larger increase in base collector current. That pulls the collector towards the emitter, which decreases the collector voltage. Since the collector is the output, this configuration is an inverting amplifier.
What is odd parity even parity?
Priority: Counting number of ones (1s) in the unit of data, since 0 is zero.
Example: a unit of data: 1001 (=0x09) where number of 1s is 2 making even parity.
So, the parity bit - the most significant bit will be '0' - "even" which makes the byte 0000-1001 or 0x09.
Add 1, makes 10 - or xxxx-1010 still 2 bits set, making also even parity 0x0a.
Add 2, makes 11 - or 1000-1011 - 0x8b
You can make a simple transistor as a "gate" we call XOR. If one OR the other pin is raised, then raise pin out. If none or both are set, pin out is set low. The difference between OR and XOR is the result of both.
But use the "overflow" 4th pin of an OR "gate", and use this as input to the next bit and you "ADD" binary.
How do you make wireless alarm?
First you need a transmitter that is operating in the 433MHz channel that will transmit signals from the sensor trigger then you need a radio receiver that will pick up the signals from the sensor that will feed the data to a MCU(Micro Controller Unit) that will make decisions on what to do with the data, see this Kit at URL http://pyrro.patenttrade.net/product_info.php?products_id=36&osCsid=167f9a30363e51d6854b4c6d10ac38fa
How will the armature current and the output power of a dc shunt motors change with increasing load?
With increasing torque load the armature tends to slow down; the motor draws more current to compensate, and if there is armature resistance the back emf generated by the armature falls to allow the increased current to flow, which causes the motor to settle at a lower speed.
The mechanical output power is the speed times the torque, and increasing the torque increases the power output provided the speed does not drop much.
What is the function of field winding in DC generator?
The motor needs the current and magnetic flux to create
motion
The magnetic field is created by field winding where as
armature carries the current resulting into the rotation of
armature
If you are talking about the wiring of buildings/houses then blue would be a hot with ac current. If you mean wire in electronics then it would also "usually" be a positive but if there is any danger you should never assume. A tester could save you from having to buy a new component or your life.
AnswerThe European convention is that blue insulation indicates a neutral conductor, brown, black, or grey insulation indicates a line conductor, and a yellow/green striped conductor indicates an earth conductor.
Need for generating high voltages in laboratory?
because in laboratory almost we are using only three phase equipents,so we require more pewer in laboratory, thats why we are generating high voltage in laboratory.
What is the main advantage of Doppler radar over conventional weather radar?
The Radar that works on Doppler effect : it works on the principle of Doppler Effect. This effect is applicable to sound waves and electro-magnetic waves, which travel through some medium or through free space. The Doppler Effect states that when there is relative motion between the source of very high frequency signals and the observer, then frequency shift occurs.
In CW radar, a constant amplitude continuous microwave sine wave is transmitted. The echo is also a constant amplitude microwave sine wave of SAME frequency, but of lower amplitude, due to loss of energy during traveling of the wave.
While detecting the target like aeroplane, ship, missile etc. the echo undergoes change in its frequency. This change of frequency between the transmitted signal and received echo is used to determine the relative speed and direction of motion of the target. For this following formula is used -
V = 1.1 x fd x l
The above is true, but is also worth noting that Doppler radar offer's the forth degree of freedom in radar tracking as Range dot, or Doppler/Range-Rate. With more degrees of freedom then just Azimuth, Elevation & Range, tracking filtering can offer better results in say a Kalman Filter Tracking solution. Doppler profiles can be useful for distinction of distributions the difference between a man walking and a car driving etc (with man-portable radar like BLightER, or MSTAR). Doppler information can be used for SAR and ISAR imagery when the range Doppler matrix is collected at a high fidelity and interpolated correctly for a formation. It also should be noted that Doppler measurement is made via a Fourier transform rather then an statistical process, the statistical process relay own correlation of signal and de-correlation of noise where as the Fourier process is a reordering process and can provide a better signal to noise.
Why digital multimeter more accurate than analog multimeter?
An analogue instrument is analogous to the unit being measured. For instance, a thermometer uses a fluid, such as mercury, which reacts to heat, expanding and contracting, and thus providing a direct reading upon a calibrated scale. Similarly, a stadiometer measures a person's standing height by sliding an arm down a scale until it touches the persons head. In both cases, a reading can be taken directly off the scale, thus the scale is analogous to the quantity being measured.
Digital instruments, on the other hand, must encode these analogue measurements into digital information. However, analogue information is infinite. That is, between any two fixed points upon a scale there are an infinite number of variables, just as the number of real values between 0 and 1 is infinite. Digital information cannot encompass the full range of infinite values, therefore digital information must employ a degree of precision; values must be rounded. However, humans do this anyway. If we're measuring distance in millimetres then we will round to the nearest millimetre.
The amplitude of a sonic waveform at any given moment in time also has infinite range, from -1 to +1. When we digitise analogue audio signals we use approximation by scaling the analogue value to an integer in the range -32,768 to +32,767 (assuming 16-bit precision). This inevitably means some data will be lost. However, one hopes, the loss is so minimal that it will not be missed. If we need to capture the signal more accurately, we simply increase the number of bits to give a wider range of scaled values. So 24-bit would allow a range of -8,388,607 to +8,388,607.
impossible.... maybe word it differently??
One of the most frequent uses of scopes is troubleshooting malfunctioning electronic equipment. One of the advantages of a scope is that it can graphically show signals: where a voltmeter may show a totally unexpected voltage, a scope may reveal that the circuit is oscillating. In other cases the precise shape of a pulse is important. In a piece of electronic equipment, for example, the connections between stages (e.g. electronic mixers, electronic oscillators, amplifiers) may be 'probed' for the expected signal, using the scope as a simple signal tracer. If the expected signal is absent or incorrect, some preceding stage of the electronics is not operating correctly. Since most failures occur because of a single faulty component, each measurement can prove that half of the stages of a complex piece of equipment either work, or probably did not cause the fault.
Once the faulty stage is found, further probing can usually tell a skilled technician exactly which component has failed. Once the component is replaced, the unit can be restored to service, or at least the next fault can be isolated.
Another use is to check newly designed circuitry. Very often a newly designed circuit will misbehave because of design errors, bad voltage levels, electrical noise etc. Digital electronics usually operate from a clock, so a dual-trace scope which shows both the clock signal and a test signal dependent upon the clock is useful. "Storage scopes" are helpful for "capturing" rare electronic events that cause defective operation.
Another use is for software engineers who must program electronics. Often a scope is the only way to see if the software is running the electronics properly.
What is Reverse Saturation Current of a diode?
When a diode is operated as reverse bias the current flow is almost completely blocked. A small amount of current is still able to travel in reverse through the diode and this is referred to as the reverse current saturation.
Why base of transistor is lightly doped?
The width of the base is very thin to increase the majority carrier concentration gradient in the base region thereby enhancing the diffusion current and also to reduce the number of majority carriers lost due to recombination in the base.
What is a basic element of communication?
The basic element of communication is speech. You can speak or write to someone in order to communicate with them.
How embedded systems is used in dishwasher?
Yes an embedded system by definition is a combination of hardware and software,here both are combined together for a specific task .
What is the meaning of the word electronic sources.?
its acctually a phrase...an electronic source is somewhere in which electricity comes from e.g. plug socket, generator, battery, computer power supply...
Is it correct to say that a bulb in a circuit is a resistor?
Yes it is. The filament in a standard incandescent bulb is a type of resistor. An incandescent light bulb contains tungsten which reduces electricity and converts electricity to heat and light. All incandescent bulbs are resistors, but only a fraction of resistors are bulbs.
If you want to see if a bulb is a resistor, try adding another bulb in series without changing the voltage. Both bulbs will be very dim. Another way to test this is to get a multimeter and set the meter to the resistance setting. If you get any value other than zero, then it is functioning as a resistor.
What is the difference between a gigabyte and MHz?
gigahertz is the processing speed of your CPU(eg. 1.8GHz,2.8Ghz etc).It's the speed at which your processor runs. Gigabytes is the unit in which data(any data)in your RAM,HardDisk,Memory card or any other storage device can be stored is measured.simply,Its the unit to measure the data storage capacity.Eg- 2GB RAM,160GB hard disk etc..
