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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 does voltage remain constant in the reverse breakdown region in a zener diode?

This space is for answering "http://wiki.answers.com/Q/Why_does_voltage_remain_constant_in_the_reverse_breakdown_region_in_a_zener_diode" Why does voltage remain constant in the reverse breakdown region in a zener diode?

What is semi controlled rectifier?

such a control rectifier that control or rectifier single phase. for that purpose we used SCR that is called single phase controlled rectifier.

Name two electromagnetic wave use to carry through an optical fiber?

We usually use some form of coherent light wave in fiber optic conduits to move data. That means a laser and the emission of light somewhere at or about optical wavelengths.

Is it possible to use class c amplifier in FM transmitter?

Technically possible, but not something you want to do. Once the carrier has been AM modulated, you need to handle it tenderly after that. Specifically, distortion has to be prevented, because distortion means new frequencies are introduced into the package, which makes the AM signal wider in occupied bandwidth ANDmakes AM sound terrible. Preventing distortion means the package can only be handled with 'linear' stages, and a Class-C stage is possibly the most non-linear kind of amplifier there is, since it's completely cut off for part of each RF cycle. By the way, this is the reason that AM is normally modulated in the RF power amplifier ... the last stage before the antenna. It would be a lot cheaper and easier to modulate at low level ... where much less audio power would be required ... and then RF-amplify the package for transmission, as is done in FM. But AM is so sensitive to distortion that it takes too much TLC to power-amplify it once it's been modulated. So amplifying (or frequency converting) are generally avoided after AM has been modulated.

Advantages of programmable logic array-PLA?

used as mux and demux , used for implement haff adder $ full adder, by program it

Why cmos is used more than other transistor?

Lower power dissipation (except at very very high switching rates, as almost all the power dissipated by CMOS is during switching).

What gate the output will be low for any case when one or more input are zero?

An inverter has a high output when the input is low, and a low output when the input is high.

What humans use radio waves?

Radio waves are used to transmit signals from a radio station, and you can receive the signals with a radio, and hear them as sound such as speech or music. The long wavelength of radio waves makes them a suitable medium for transmitting over a large range.

it is also use in agriculture......

it is used to diagnose different diseases

What is the current produced when a voltage of 60 V is applied to a resistance of 15?

As the question didn't say whether the resistors were in series of parallel, perhaps both eventualities should be looked at. In series, the total resistance is the sum of the series resistors. The 30-ohm and 60-ohm resistors sum to 90 ohms. Total current will be voltage divided by resistance. The 220 volts applied divided by the 90 ohms will give 2.44 amps (2 4/9ths amps). In parallel, each resistor is connected indendently across the 220-volt source. Each one will "feel" the 220 volts and draw current accordingly. Since current equals voltage divided by resistance (just like always), we have to make the calculation for each resistor. The 220 divided by 30 equals 7.33 amps (7 1/3 amps). The 220 divided by 60 equals 3.66 amps (3 2/3 amps). The two branch currents each represent a part of the total circuit current, we have to find the sum of the branch currents to find the total current. Our 7.33 plus 3.66 amps sums to 11 amps.

What is the difference between microcontroller and psoc microcontroller?

Psoc includes the analog and digital component where else in controller only digital. :P

How rays can be produce by cathode ray oscilloscope?

A: xray emits from TV, OSCILLOSCOPE and some more instruments due to requirement of hi voltage to see the display

What container can you use to drop an egg but keep it from breaking?

you use an plastic container because it is best to use when doing an egg drop experiment

What is bias Examples of bias in a study?

Bias is some personal preference which interferes with fairness or objectivity. For example, I might have a bias in favor of men over women, so when I am hiring new employees I hire only men. Or I might have a bias in favor of my own ethnic group. Or I might be biased in favor of tall people and against short people.

How do you measure Electromagnetic Interference?

Electromagnetic radiation can described using these characteristics:

  • Frequency (f')
  • Wavelength (ƛ)
  • Velocity (v)
  • Amplitude

The first three are related via a simple formula:

ƛ = v/f'

The final characteristic equates to power. The instruments used to measure these characteristics vary widely depending on the range of frequencies. Some are detectable using an antenna like the low power (amplitude) microwaves used in a mobile phone, while others are detected by the wave colliding with a sensitive material like the sensor in a camera. Infrared radiation can be detected as heat.

How does a frequency inverter work?

A frequency converter converts alternating current of one frequency to alternating current of another frequency.

Generally it's used for controlling the ac motor speed by changing the supply frequency.

A 14 volt lightbulb is equal to how many watts?

If you have 14 watts, you have 14 watts of power. We measure electromotive force (EMF), which is commonly called voltage, in volts. EMF (voltage) is the force that will drive electron current flow, which is measured in amps. Simply put, power is current times voltage, or, said another way, watts is amps times volts. If you have 14 watts, you could have 14 amps at 1 volt, 7 amps at 2 volts, 2 amps at 7 volts, or any other combination of current and voltage with a product of 14. You may have picked up that because watts is amps times volts, we can say that a watt is a volt-amp. Extending that thinking, 14 watts is 14 volt-amps. There is no way to write 14 watts in volts, at least not without having a bit more information.

What is the difference of 50 and 60 hz?

Whoa.... Please rethink your question and ask it differently because:

North America uses 60 Hz at 120 or 240 Volts power. Normally 120 volts in hotel rooms and home living areas; normally 240 volts for an electric kitchen stove.

Europe, Asia & Australia use 50 Hz at 240 Volts power. Everywhere.

Both 50 Hertz (Hz) and 60 Hz refer to the number of cycles for Alternating Current (AC) as opposed to zero cycles in Direct Current (DC). Flashlights and automobiles work off their DC battery.

There is a historical reason why North America and Europe use different cycle (hertz) systems but for the traveller this is what you should know:

1) A 120 volt electronic device will blow up or smoke or melt if plugged into a 240 volt system.

2) A 240 volt electronic device will either run slow or not at all if plugged into a 120 volt system.

3) Most countries have their own style electronic plug to match a wall socket (mains) so the chances of YOUR device matching the visited country's wall socket is not promised.

4) Many devices such as modern laptop computers have dual-voltage/dual cycle power adapters that allow them to be used world-wide. Some devices such as modern hair dryers have a switch in the handle allowing the user to choose between 120V or 240V.

5) 120V is sometimes called 110V and 240V is sometimes called 220V - as a traveller you really don't care about terminology and it makes no difference to you or your electronic device(s).

What is the difference between a series ohmmeter and a shunt ohmmeter?

Basically, your series and shunt ohmmeters differ in circuit configuration. Your series ohmmeter is configured in a way that your "meter" (which has internal resistance) is connected in series to your "measured resistor" and we all know that those TWO resistances will ADD up causing some sort of inaccuracy. While on the other hand, your shunt ohmmeter is configured in a way wherein your "meter" is connected in PARALLEL to your "measured resistor" that will ease-up the inaccuracy but will only measure resistances ranging from 200 Ohms to 400 Ohms (typically and depending on your configuration).

What are the differences between resistance and capacitance and inductance?

Resistance is like frictional force. It opposes flow of electricity. So this will consume some electricity in the form of heat. Measured (in Ohm) Inductance (in Henry) nd capacitance (in farad) stores energy in their electromagnetic nd electrostatic fields respectively. They don't consume any power. But in real scenarios due to the element's internal resistances used in design they usually have a drop. But these two have important spot in engineering. Both of them effects the powerfactor in the circuits.

1 What is the current flowing through a closed circuit if R equals 1000 Ω and V equals 5V?

The voltage drop is equal to the total resistance across which it is dropped multiplied by the current flowing through this resistance.

i.e. V=IR (where V is the voltage drop, I is the current and R is the resistance)

Thus, I=V/R

So I=5/1000 A = 5*10-3 A = 5 mA

So the current flowing through your circuit is 5mA. Note that this answer is theoretical, and that it may differ from what you observe in practice due to component tolerances (resistors with the gold band at the end are only accurate to within 10%).

Is semiconductor diode better than vacuum diode?

at thebeginning of electronic technology the vacuum tube was used in electronic circuit. .but now a days semiconductors are used in electronic circuit

What is ohm's law and write three forms of ohm's law in a equation?

Ohm's law relates voltage, current, and resistance.

Voltage is current times resistance

Current is voltage divided by resistance

Resistance is voltage divided by current