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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 device is used to increase or decrease the voltage of an alternating current?

A transformer is the device used to increase or decrease the voltage of alternating current (AC) This is done through a process referred to as inducing.
It's operation is based on the fact that electricity produces a magnetic field around itself. By placing 2 coils of cable beside each other, the magnetic field of one coil will induce a voltage in the other coil.

What is the charging time on a 9.6 volt battery?

No, not unless it has a voltage or current regulator or series resistance to limit the current (built in somewhere).

How do you design a half-adder using NOR gate?

Use 4 NOR gates.

For the 1st NOR gate, inputs should be x' and y

For the 2nd NOR gate,inputs should be y' and x

The outputs of NOR 1 and NOR 2 are taken as inputs of NOR gate 3

The output of NOR 3 is the complemented form of the output required, so, just complement the output of NOR gate 3 with another NOR gate and Viola!, you have your HALF ADDER OUTPUT

PS:I have used a double rail logic, where both x:x' and y:y' are available

What is single tuned voltage amplifier?

it is a circuit consisting of a tuned circuit with a capacitor in parallel with inductor and it is connected to collector terminal in common emitter configuration,, and it is used as frequency receiver

What 3 factors that affect the output of a generator?

1:The strenght of the main magnetic Field. Determined by the strenght of the field magnets in a permanent magnet machine, or by the number of turns of wire on the field coils and the current through the coils in a wound field machine.

2: The number of armature conductors connected in series, which cut the main magnetic field. Determined by the number of turns on armature coils and weather the armature is lap or wave wound, which determines the number of armature conductors connected in series.

3: The speed at which the armature conductors cut the main magnetic field. The faster the armature cuts the magnetic Field, the higher will be the value of the voltage generated in the machine

How will the resonance frequency change If the resistance in an RLC circuit is doubled but he capacitance and inductance are unchanged?

For to keep the resonant frequancy constant L*C has to stay same. Lets say if you double L you have to divide C by 2 to keep the same resonant frequency. If only L increases Resonant frequency decrease, this is same for C.

What is the frequncy range of digital signal?

Telephone bandpass is 300Hz to 3000Hz. This is adequate for a recognizable and understandable voice, however the lack of high frequencies makes some people sound different on the phone.

Local calls often have a slightly wider bandpass, but long distance calls are sharply filtered to cutoff at exactly 3000Hz, to avoid spillover into adjacent channels during the process of frequency division multiplexing so that many voice connections may be sent on one line (e.g. twisted pair, microwave link, optical fiber) at the same time.

Why are homes powered by ac and not by dc current?

power station may also provide dc voltage with using of dc generator but it is not economical to transmit the dc voltage. Since the step up and step down of dc voltage is not possible directly using transformers, we'll have to transmit domestic supply voltage (DC, as your inquiry). But transmission of a DC voltage over lengthy lines would result in a much less voltage at receiver's end.

So, considering the efficiency, economy and easiness, AC is preferred to DC.

Why does voltage matter?

Voltage is a measure of electrical potential. I understood voltage best when my first semester Electronics professor told the class that voltage is to an electrical circuit as water pressure is to a plumbing "circuit".

List two differences between information signal and carrier signal.?

A: A carrier carry information by modulation either Amplitude or Frequency modulation. Therefore AM and FM RADIO M stand for modulation

How do you use Ac and DC multitester?

As applied to household AC conventions, there should be no voltage from N to Ground. Neutral is white, hot is black, ground is green. There should be voltage from black to N, Black to G, but not N to G.

Outlets are properly placed with the ground pin down, which puts N, to the left, and Hot to the right. Neutral is the wider one.

As applied to general electronics, the question needs a reference. There is AC, which takes two wires, and a Ground, which may be common to one lead of the AC, or separate, or exist at the center tap of a transformer, making each AC lead half the rms voltage of the lead to lead voltage.

With your multimeter set on voltage, stick one of the probes in the short slot and the other end in the ground opening. The meter should show 120volts. If not, stick one of the probes in the long slot and the other probe in the ground opening. If the meter shows 120 volts, then the polarity is wrong.

Another option would be to have the meter set on resistance. Stick one probe in the long slot and the other probe in the ground opening. There should be no resistance (the circuit will be closed). If the circuit shows open, relocate the probe from the long slot to the short slot. If the circuit shows closed, the the polarity is wrong. This assumes though, that the outlet actually has a ground wire hooked up to it.

How many diodes are used to make a half wave rectifier?

You use a half-wave rectifier where the system design does not require a full-wave approach.

Half wave rectifier output is used for running ac motors.

Can a transformer work using dc?

no. because if we use dc source for transformer there will be no production of energy for the secondary side since they are mutually conducted, as the transformer is a static device which can transmite the energy from one circuit to other with out changing the frequency and also there is no movement of the conductors. in order to produce the emf there should be either conductor movement or moving flux so the dc source will produce constant field flux hence there is no production of energy in the secondary side.

What is difference between resistance and reactance while both are measured in ohms?

Resistance is constant no matter the frequency applied. Reactance varies depending on the frequency of the power applied to it.

How does a diode change from AC to DC?

it clips all the bottom voltage off the sine wave,to get steady dc voltage you will need to clean up the ripple to get good voltage regulation

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A diode does not change AC to DC, but it does allow alternating current to flow in only one direction. A diode (or often 2 or 4 diodes) with a filter can be used to rectify AC into DC.

What is the use of IC 7809?

The 7809 IC is a three-terminal nine volt linear regulator IC. You provide 11 or more volts on two terminals, and the IC provides a regulated 9 volts on two terminals, one of which is common, i.e. ground. It is useful in simple circuits, where only a few amperes is required, though it can be boosted using power transistors. For higher current applications, however, a switching regulator design is better.

Why wouldn't you want the circuits in your home to be series circuits?

In series, each device creates a voltage drop related to the current and impedence of the device, therefore, the voltage for the devices in the circuit are not the same.

Addition:

Also, in a series circuit, if one device fails, all others in the circuit would also "turn off" - think older strands of Christmas lights.

Lets say for example that all the lights in your house were in a series circuit. When you turned the circuit on, all the lights would come on, but when you turn the switch off, all the lights would also go off (possibly useful when leaving for the day or going to bed). Now, one light bulb blows out...every light in the house would go out, leaving you to try replacing every light in the house until you found the correct one...in the dark.

What are the differences between analog and digital transistors?

transducer convert one energy to other energy .now in analog transducer it convert energy use of analog signal and digital it converts use og digital signal

Which can transmit faster optical fiber or copper wire?

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What atomic particle that has a positive and negative changes?

maybe a neutron

when Millikan messed with oil drops he kinda thought the steps he saw were unit charges.. now we are getting strange and quarkey and consider an electron to be 2/3 of a unit charge made up of smaller units witch are real unit charges

but with the infinite knowledge of the senate and congress the super collider was killed so we may never know.

What is transistor checker?

A: Any VOHM can check a transistor but only as good or bad .It will never tell you how good or how bad. A TEKTRONIC curve tracer does a very decent job for these devices.

What are rectifier diodes?

a diode current rectifier is a device that uses 4 diodes arranged in such a way that it converts alternating current into direct current

the arrangement is called a bridge rectifier

it is very simple in how it works but the best way to understand how it works would be to see a diagram of a bridge rectifier with the current directions marked out on it

When the input connected to the left corner is negative, and the input connected to the right corner is positive, current flows from the lower supply terminal to the right along the red (positive) path to the output, and returns to the upper supply terminal via the blue (negative) path.diode-bridge