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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 working principal of the xerographic photocopier?
The dry paper copier, or photocopier, uses the photoelectric effect as its basic working principle.
The process is to spray electric charge upon the smooth surface of a semiconductor and then flash an image to be copied onto this surface. The light causes the plate to discharge in that local area. When pigment powder is sprinkled over the plate it sticks to the charged spots and falls off the discharged spots. The plate is then placed in contact with a blank sheet of paper to which the powder is transferred. Then the paper is heated under pressure to stick the permanently pigment to the paper.
Yes glycerol is saturated in hydrogen. Glycerol is found in both unsaturated and saturated fats and can bond with fatty acids.
Because alternating current (AC) voltage varies over time, to the positive and negative, an actual AC voltage measurement will not be the same as a DC voltage measurement. For example: 5 volts DC is 5 volts constantly, viewed over time. The average voltage is 5 volts. 5 volts AC (from zero to peak) is not actually 5 volts constantly, but varies between 5 volts and 0 volts over time. The average voltage will not be 5 volts. Using RMS AC values is designed to make AC and DC measurements equivalent, for example 5 volts DC and 5 volts RMS AC are almost identical.
What is the reason of connecting shunt parallel to galvanometer?
to reduce the flow of current & keeping the current through galvanometer within safe limits.
How do you change AC voltage to DC voltage?
AC to DC convertor. Or build your own with four diodes,reostat, and filters.
This type of circuit is known as a rectifier and is usually done with diodes, which block portions of the + and - cycles at a given point in time, allowing the other part of the cycle to pass. Rectification can be either full or half wave.
What is the application for amplitude shift keying?
ASK is used to transmit digital data over optical fibre, to transmit moarse code etc
Is a resistor a linear device?
Yes, if you are talking about the normal carbon composition types having colour codes. But there are some non-linear types too.
An increase in resistance in a circuit will cause?
In a simple circuit, lowering the voltage will not cause the resistance to do anything. Lowering the voltage will, however, cause the current to also lower.
This ignores temperature coefficient. If there is substantial power involved, a typical bulb, for instance, will grow cooler and its resistance will decrease when you lower the voltage, but that is usually a small effect.
What is the meaning of resistor?
Resistors are one of the three basic electronic components. They restrict the flow of current in an electrical circuit. Fixed resistors have a fixed value of resistance, and are used in almost every electronic circuit for lots of different reasons.
What is a parallel connection?
In electrical circuits series and parallel are two basic ways of wiring components. The naming comes after the method of attaching components, i.e. one after the other, or next to each other. As a demonstration, consider a very simple circuit consisting of two light bulbs and one 9V battery. If a wire joins the battery to one bulb, to the next bulb, then back to the battery, in one continuous loop, the bulbs are said to be in series. If, on the other hand, each bulb is wired separately to the battery it is wired in a parallel circuit.
How can the leakage flux be minimized?
by bringing the primary and secondary windings as close to each other reducing the air gap. interwinding the primary and secondary.
Additional Answer
Another method is to use a wound core, rather than a stamped core.
Computer Architectures - Digital Circuits - Latches and flip-flops
In the same way that gates are the building blocks of combinatorial circuits, latches and flip-flops are the building blocks of sequential circuits.
While gates had to be built directly from transistors, latches can be built from gates, and flip-flops can be built from latches. This fact will make it somewhat easier to understand latches and flip-flops.
Both latches and flip-flops are circuit elements whose output depends not only on the current inputs, but also on previous inputs and outputs. The difference between a latch and a flip-flop is that a latch does not have a clock signal, whereas a flip-flop always does.
Latches
How can we make a circuit out of gates that is not combinatorial? The answer is feed-back, which means that we create loops in the circuit diagrams so that output values depend, indirectly, on themselves. If such feed-back is positive then the circuit tends to have stable states, and if it is negative the circuit will tend to oscillate.
A latch has positive feedback. Here is an example of a simple latch:
How does the charge vary with time in the R-C circuit?
well to get the answer first know the principle by which a capacitor(consider a capacitor without dielectric) gets charged .let a capacitor with plates p1 and p2 and resistor in parlell are connected to a DC source , when the switch is closed the circuit is in ON state and current starts flowing ,assume the flow of current as the movement of negative charges then the concept would be much clear.
assume that p1 is connected with positive terminal of the battery and p2 with the negative terminal ,now as the switch is closed the negative charge on p1 is attracted by the positive terminal of the battery and is driven to the other plate p2 of capacitor.as this process continues charge seperation increases and potential difference starts getting developed and after a very long time the potential diff. across capacitor becomes equal to the applied voltage V.
the maximum charge is Q0=CV
and charge at any time is , Q(t)=Q0(1-e^(-t/T))
where T=time constant of the circuit
Do electrons really flow when current flows?
That means that there is actually something - the electrons - flowing in the specified direction. On the other hand, the "conventional current" is defined as the equivalent flow of positive charge. In the case that the charge carriers are negative (such as electrons), the conventional current flows in the opposite direction to the actual movement of charges.
Appliance that use seris and parallel Circuit?
Pinball games use complex arrays of series and parallel circuits. So do electric stoves.
But let's look at a simple one ... a toaster.
The toaster has several heating elements ... maybe four individual heating wires, one on each side
of the bread slot, and two bread slots in the machine. They're all in parallel ... one end of each heater
goes to one prong of the electric plug, and the other end of each heater goes to the other end of the plug.
BUT ... in series with one group of heater ends is a very important circuit element: the Switch.
When the switch is in a high-resistance state ("OFF"), no current flows through any branch in the
parallel section, i.e. the heaters remain cold. When the switch is in the low-resistance state ("ON"),
current flows through all of the parallel branches, and the result is toast.
What is a laser diode used for?
Laser diodes have a vast number of uses from fibre optics for telecommunications to CDs and DVDs. They are the most common laser type with an approximately over 1 billion units sold. Laser diodes have become more popular in medicine and dentistry in the last few decades as the are user friendly, they perform typically well with soft tissue procedures as they have a high absorption rate for hemoglobin.
What do you call something that cannot pass electricity?
Diode's are restrictive to one direction of current only.
A resistor will limit the amount of current in a circuit.
What is the difference between no load current and no load voltage?
What does the question refer to? Induction motors? Transformers? For transformers, the no-load voltage is the voltage -- across the secondary or primary -- when there is no load attached to the secondary, that is, when there is no current in the secondary. No-load current really only makes sense when talking about a motor, because current is flowing in the device even when it's not under load. A rule of thumb is the no-load current is about a third to one half the full-load current.
What does open ohms look like on an ohmmeter?
Scroll down to related links and look at "Ohm symbol - Google images".
How anode rays are formed from the gas?
Gas discharge tubes are what cause the formation of the anode rays. Several thousand bolts are put towards the cathode, which is apart of the gas discharge tubes, and the anode. This creates the anode rays.
Will each of two bulbs connected in parallel be as bright as a single bulb connected to a cell?
The brightness of an incandescent light bulb depends on the voltage applied across its terminals. Connecting one, two, or five light bulbs of the same rating to a battery in parallel will provide the same brightness from each bulb.
What is multiplexer tree in digital circuit?
Which has more number of input, It can be obtained by cascading two or more multiplexer with less nunber of inputs.
Why is differential amplifier preferred over single ended amplifier?
The input stage of an op amp is usually a differential amplifier; this is due to the qualities that are desirable in an op amp that match qualities in a differential amplifier: common noise rejection ratio; low input impedance, high output impedance, etc.
The use of differential amplifiers in op-amps is to increase the input range and to eliminate common entries like noise.
What is the Effect of tolerance on power of the resistor?
For example, a "220 ohm" resistor with a tolerance of 10% (silver band) has an actual resistance somewhere between 198 and 242 ohms.
