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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
Orgasms or "climaxes" are the build up and "explosion" of pleasure. When a spot of pleasure is hit repeatedly (sometimes fast and hard), a build up of pleasure begins. When your body hits the point where it can't take the pleasure anymore, it releases it's build up, hence the orgasm part.
What is the effect of coupling capacitor?
It can be said that capacitors pass alternating current but block direct current. Coupling capacitors at the input and output of a circuit isolate the direct current within that circuit from the input circuit and the output circuit, respectively. Only the input signal is allowed in, and only the output signal is allowed out.
How do you make lights which flash to music?
A: First thing is to decide on the lights, incandescent, LEDS Xmas bulbs? Then the decision pertains to the power source battery, AC source I assume AC source with Xmas 120v string I think 3 colors should be enough. there is a photo isolator chip 8 pins cd3022 its output is a triac so that it ca drive another triac. Depending on the load tie a 1.5 k to the gate if there is a large load [current] and that should do it. music in lights out. I suggest blue green and white to signify the low med hi. If you need help ask questions the chip data can be found at datasheetlocator.com BUT I FORGET THE MANUFACTURE. Good luck. The final triac must be able to handle 300v and the current is really depends on the load Xmas lights are only 100 milli amps each so there is no much current LEDS can be as hi as 30 milli amps.
What are the voltage and current characteristics of a series circuit?
The voltage and current characteristics of a zener diode in the forward bias condition (anode more positive than cathode) are similar to an ordinary diode.
Below the cutoff voltage, the current is near zero, excepting for leakage current. Starting at the turnon voltage, the diode starts to conduct. As voltage increases, current increases. At this point, increases in current result in very small increases in voltage. Above the breakdown current, the diode tends to self-destruct. The cutoff voltage for a silicon diode typically ranges from 0.6V to 0.7V, and the beginning of the flat region ranges from 0.7V to 1.4V, depending on the current rating of the diode. The cutoff characteristic is also highly dependent on temperature.
It is important to understand that, while the current to voltage curve is relatively flat between the cutoff and breakdown points, it is not completely flat. This is normal diode behavior.
In the reverse bias condition (anode more negative than cathode), the zener diode behaves very much like its forward bias condition, except that the cutoff voltage and flat region range are higher and, sometimes, flatter. This is what a zener is used for - it makes a good voltage regulator.
In AC current, its a quality measurement of voltage. If voltage is harmonious or "clean" you will see an equal wave length on both sides of your baseline. You can test and see this using an electrical scope.
A baseband filter is a device that only passes frequencies inside the interval (0,B), where B is the maximum frequency of the signal.Example: The human voice occupies a spectrum from 0 Hz to 3400 Hz, aproximately. A baseband filter would only let those frequencies pass.The difference between a band-pass and a baseband filter is that the latter is a band-pass filter with its lower cut frequency being 0.
What is effect of an unbypassed resistor on the common emitter amplifier circuit?
An emitter resistor in a common emitter circuit will cause the stage to experience the effects of degenerative feedback if it is unbypassed. The degenerative feedback reduces gain. This is probably the primary effect in the described circuit.
What are the advantages of analog modulation over digital modulation?
1)digital modulation can easily detect and correct the noise. where as analog modulation has little complexity 2)security is more in digital modulation 3)digital modulated signal can traverse a long distance compared to analog modulation
What is the best way to describe the function of a typical transistor in an electronic circuit?
A transistor in a circuit can do many things. It can be used to amplify voltage signals, or current signals, create current and voltage sources, make buffers, and so on. Transistors also find a major use in logic circuits (ie, where signals can either be a '0' or a '1'), where they essentially act as a switch, and can be used to create inverters, AND gates, OR gates, and all sorts of useful components.
By itself, a transistor is a three-terminal device that can control the current going through two of its terminals through the voltage applied at the third terminal.
But there are many applications for a transistor in its many different configurations, which is why it is so important in modern electronic technology.
What are the differences between a schmitt trigger and multivibrator?
comparator will change its state when the voltage exceeds a threshold it will return to the intial state when the voltage drops below this threshold.
schmmit trigger will change its state when the voltage exceed a threshold and willl not return to the intial state until the voltage drops at a certain value below the initial threshold. The s the reluctance of the schmmit trigger. Something like inertia in mechanics. That's why Schmit trigger can oscillates. Something somehow similar to the negative resistance in diodes which make them oscillates.
high voltage gain :- common base since the ratio of output impedance to the input impermanence is very high in common base mode
high current gain :-common collector since it is the ratio of Ie/Ib
Why most of the practical loads are inductive?
Most loads are actually resistive, such as an incandescent (normal) light bulb or electric heat or cooking equipment. Other loads are mostly inductive because they incorporate either transformers or motors, which are both inductive. Off hand I cannot think of a normally capacitive circuit, which would be the opposite of inductive.
How do you convert 3 ohms to amps?
The voltage drop across a resistor is calculated using Ohm's Law. For a DC or direct current circuit then
V=IR where V is voltage in volts, I is current in amperes, and R is resistance in ohms
If this is a DC circuit the voltage drop is 3A*3ohm=9V
What are the advantages and disadvantages of texting?
The one activity that has grown enormously during the past few years has been texting. Many children have started this 'new' thing, either because they don't want to be the bump on the log, or they just want to be the popular kid in school. But one thing they don't know is that texting has it's disadvantages.so when texting goes through your mind think about these advantages and disadvantages.
How would the bulbs shine in a series circiut?
An electric light bulb, incandescant type, is designed to operate at a certain voltage. Let's take 12 volt car headlights for example. Two 12 volt lights are connected in parallel in a car to provide the headlights, the same 2 lights could be connected in series if used on a truck with a 24 volt battery, or 20 of the lights could be connected in series if connected to a 240volt home electric circuit. (In the US think of 10 connected in series on your 110 volt system.) The lights would each produce about the same light output, but the number of lights would cause more light in total.
In series there is a problem, when one light failsm they all go out. That's why lights in a house are connected in parallel.
How do you increase and decrease the speed of an AC motor?
You really can't really "control" the speed of a the commonly available home-use 120 VAC fans.
The problem is that most of the motors on the "regular" fans are synchronous motors, and they want to sync with the line by virtue of frequency. Fans with different speeds have different windings in them that are specifically set up for the different speeds. A switch allows the different windings to be selected. Simply reducing the line voltage will only reduce the torque the motor will supply, but will not directly affect its speed. The lower torques will cause the motor to slow down, and that's true, but this is not necessarily a good thing as the fan was not designed to run like this.
Sophisticated electronic variable frequency drives (VFDs) are designed to provide AC power but at a frequency you can control. Your ability to control the frequency gives you the ability to control the speed of the fan directly. But these units cost. For the smaller non-commercial units, it is smarter (and cheaper) to just get another fan with multiple speeds than to try to fool around and control the speed by some "gizmo" or something else.
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I beg to differ. Most home fans are inexpensive single phase AC motors, either with a capacitor (PSC) or shaded pole. These are not synchronous motors. A simple light switch dimmer (aka phase controller or triac controller) can be used to control the fan. Caution: be careful to avoid fan stalling when setting at low speeds. The dimmer controls the speed by reducing the effective voltage to the fan. At low voltages (and resulting speeds) the fan torque is also reduced. Thus the likelihood of stalling is higher. If the fan stalls with the power on, the motor will overheat and possibly catch on fire.
VFDs are definitely not the right choice for a simple fan. These require motors (almost always 3 phase) designed for use with VFDs (aka, inverters) or a special output filter for the controller. Otherwise the bearings will pit within months to a year. Besides, VFDs with a single phase output is very rare.
Increasing the armature voltage would increase the speed. In a separately excited dc motor the speed adjusts so that the back emf generated by the armature is a little less than the supply voltage. The difference, divided by the resistance, gives the current drawn, which is also proportional to the shaft torque supplied to the load.
The power factor of a purely resistive circuit will be?
The power factor of a purely resistive circuit is 1.0.
Why is micro-controller called as micro-controller?
It is called a microprocessor because it is the single microchip integrated circuit processor of a microcomputer. The term minicomputer was already taken and referred to small computers whose processor was built of many different microchip integrated circuits. There was never anything called a "miniprocessor" in these computers, just as there was never anything called a "mainframe processor" in the big computers.
Note: Some early microprocessors were not single microchips, but were instead a family of related microchips that could be interconnected in a variety of different ways (e.g. AMD 2900 family). This served two functions:
- it avoided the limits of the number of transistors that could be put on a single microchip with the technology available then
- providing greater design flexibility (e.g. the same microprocessor family could be used to build microcomputers having very different word lengths depending on the requirements: 16 bit, 32 bit, 48 bit, 64 bit, etc.)
What is the function of 4017 IC chip?
The function of a 4027 ICs is to allow flip-flop circuits to operate. It changes the state of the circuit based on the particular needs or demands at any given time.
Why a DC voltmeter and DC ammeter cannot read AC?
Obviously, it's a voltmeter that measures a.c. voltages. The most common types are a 'moving iron' type or a 'moving coil' type. The latter requires a rectifier circuit. Both scales are calibrated to indicate root-mean-square values. Moving-iron scales are non-linear, whereas moving-coil scales are linear. Moving-iron types are less accurate than moving-coil types.
