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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
Difference between amplifier and power amplifier?
Voltage amplifiers are genrally used to amplify voltage signals to a certain db and amplification is a linear process. In power amplifiers it is not required to amplify voltage it is not significant and genraly equal to input voltage. It is significantly used to produce a large current at the output.
What is the difference between rectifier diode and zener diode?
A: They are both diodes. The difference lies in the application. A rectifier is used to rectify AC current into pulsating current. The zener diode is used to regulate a voltage source to the zener voltage when connected in the reverse direction.
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If you look at the characteristic curves of a rectifier diode and a zener diode, you will see that they are similar, but the reverse curve of the zener has a much sharper bend at what is called the "knee".
It is at this point on the zener's curve at which it operates.
Does adding resistors in series increase or decrease the overall resistance of a circuit?
Resistance in series adds together. two 100 ohm resistors in series are equivalent to one 200 ohm resistor. to make an equation out of it ( even though it is simple) you can say: Rtotal=R1+R2+R3...+Rn
What particle was found using a cathode ray tube?
British scientist Sir Joseph J. Thomson discovered in 1897 that cathode rays were made up of what are now known as electrons.
Why negative feedback is preferred in amplifier?
Because the feedback of an amplifier tends to reduce the gain of an amplifier and also, the bandwidth of feedback increases the gain of an amplifier, so in an high gain amplifier as to be stabilized.
BY
ENGINEER MUHAMMED OLALEYE OLUWATOSIN
TELECOMMUNICATION STUDENT, RUFUS GIWA POLYTECHNIC, OWO
What is the formula to find reading of ammeter?
V=I x R
Voltage= Current x Resistance
to make it easier you could rearrange the formula so it looks like this:
I=V/R
Why ohms law is not applicable to semiconductor devices?
Actually, Ohm's law is applicable to semiconductor devices.
The issue is one of perspective. The semiconductor device does not have a purely resistive response curve, so it would seem that Ohm's law falls apart.
Even in the so called linear range, you still have a somewhat non-resistive curve, so there are still limitations.
And, of, course, outside of the linear range, beyond the knee point, everything falls apart, so to speak.
That said, at any instant of time, a semiconductor device can be perceived as a resistor - yes, one that changes value - but still a resistor - at that point of time. As a result, basic circuit analysis techniques including Ohm's law, Kirchoff's laws, and Norton and Thevanin equivalents still hold true.
Answer
Ohm's Law DOES NOT apply to most semiconducting devices, because they are not linear or ohmic -that is the ratio of voltage to current doesn't remain constant for variations in voltage. Semiconducting devices, such as diodes, are termed 'non-linear' or 'non-ohmic' because their ratio of voltage to current ratio changes whenever the applied voltage changes. However, in common with ALL circuits and circuit devices, the ratio of voltage to current will always tell you what the resistance happens to be for any particular ratio. The so-called 'Ohm's Law formula' (R = E/I) is actually derived from the definition of the ohm, and NOT from Ohm's Law!
In Paging Technique there are two parts of frame address page number and page offset . Page offset denotes the internal division of page number. ex - [(001)(000)] to [(001)(111)] , here six binary digits represent a address in which 001 (first part) denotes frame number and (000) to (111) the second part denote block inside frame 001 :)
How does PN-junction diode acts as a switch?
when a semiconductor is doped with p-type and n-type impurities, a pn junction is formed which acts as a diode and prevents the charge carriers to flow to either side of junction
pn juction diode is a semiconductor device that allows current to flow only to one direction.
How do you unfreeze your touch screen phone?
Here are a few ways that can help.
1. Hold the top and Home button down together, until the screen turns off. This force's the phone to turn off. Then, just turn the phone back on.
2. Plug the iPhone into the computer.
3. Press the Home button.
You can try holding down both home and lock buttons for 10 seconds and see if it restarts.
Worse comes to worse you can resore it with putting it into DFU mode. (last resort)
What are the Advantages of analog and digital communications?
Disadvantage of Analog Communication: 1)Analog Communication systems are costlier than digital communication system. 2)Less Security in Analog Communication 3)More prone to noise interference. Advantage of Analog Communication: 1)Transmission bandwidth required is less. 2)No need of synchronization. Advantage of Digital Communication: 1)Digital Communication systems are simpler and cheaper. 2)Using data encryption only permitted user are allowed to detect the transmitted data. 3)Since in Digital Communication, channel coding is used, therefore a large amount of errors may be detected 4)Since transmitted signal is digital in nature,large amount of noise tolerance may be tolerated Disadvantage of Digital Communication: 1)More transmission bandwidth required. 2)Digital Communication needs synchronization in case of synchronous modulation.
A Unitary PLC is a Low Cost PLC used generally in small machines as it has a very low input/output count.
Still Need More Info XD
How the cellphone tower works?
You can get different plans so if it breaks in less than 60 days they'll give you a new one or 200 days or anything like that.
Why tan-delta capacitance test required?
In a pure capacitor current leads the voltage by 90 degrees. when a resistor is
introduced in between the current leads an angle less than 90 degrees.
Similarly in a Dielectric material when a cavity or deterioration starts , the life of the
material starts deteriorating , as there is a resistance getting added and hence
leakage current increases In tan Delta we find the difference in the angle and
periodically note down the pace at which deterioration takes place.
What is potential difference or voltage?
If you take two different nodes in a network and if you find the difference in voltage for those nodes then it is known as potential or voltage difference. Here the reference is not taken. But if you find potential difference between a node and its respective ground it is known as voltage at that node here reference is ground potential i.e zero.
Answer'Voltage' is synonymous with 'potential difference'; they both mean the same thing. And it is important that these terms are not confused with 'potential'. So, it is incorrect to say 'voltage difference' (which would mean 'potential difference difference'!), or to describe a voltage as existing 'at' a particular point, or 'with reference to', for example, earth or ground.
In very simple terms, if two points are at different potentials, then there is a potential difference (or 'voltage') between them. A potential exists when work is done moving a charge to a particular point; the greater the work, the higher the potential. 'Potential' is roughly equivalent to the potential energy gained by an object when it is lifted against the force of gravity.
Think of it this way: 'potential' is equivalent to 'height', whereas 'potential difference' (voltage) is equivalent to the difference between points at different heights.
What does a printed circuit board do?
A Printed Circuit Board (PCB) is the skeleton of most electronic devices. It provides not only a solid physical base for the components to be mounted upon, but also the electrical interconnects (traces) between the components.
How does an integrated circuit work?
Integrated circuit also called as chips or microchips is a miniaturized electronic circuit made in a thin substrate of semiconductor materials. It consists mainly of semiconductors and passive components of the circuit.
Closed Circuit. Means it's not broadcast so anyone can see it, but only sent to one or a few watching stations.
What is the PIV rating of diode?
A diode will provide saturating current if it reaches its Piv. What it should be well at least 1.5 of the applied reverse voltage. For AC at least 2 times to insure that the peak REVERSE voltage is blocked
What is the value of a resistor with red red brown silver?
220 ohms with a 10 percent tolerance. Red is 2 and brown is 1. Brown is in the multiplier band so it is 10 times the value in the first two bands. Silver is in the tolerance band. Gold would have been a %5 tolerance device.
What is the use of circuit maker?
Oh my god, you are so stupid, the use of circuit maker is to provide students with jolibbee is fun to eat at whenever i go for long walks on the beach and sometimes i run sometimes i hide and i wish that the mistakes are . But basically where are you Gilian Uy?
Based on what you have seen what must be true for a circuit to light a bulb?
There must be a current through the bulb in order for it to glow.
The 555 timer is a device that allows you to provide a timing signal to a controlled circuit. You provide an RC or other type of tunable circuit. Once triggered, the 555 will provide an output of a set duration. Depending on configuration, it can also be used as an oscillator, or as a flip flop.
