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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 voltage drop through a resistor of 6 ohms and 2 amps?
12 volts...!
The voltage drop across a 2 ohm resistor depends on the current flowing through it. As voltage (E) equals current (I) times resistance (R), if 1/2 amp is flowing through your 2 ohm resistor, 1/2 times 2 = 1 volt. If 1 amp is flowing through your 2 ohm resistor, 1 times 2 = 2 amps. Piece of cake.
If the two ohm resistor is the only component in the circuit, it will drop whatever the applied voltage is. Put a 2 ohm resistor across a 6 volt battery, it drops 6 volts. If you put your 2 ohm resistor across a 9 volt battery, it drops 9 volts. Another way to say voltage drop may help. The voltage drop across a resistor is the voltage it "feels" when in a circuit. And that last couple of examples says that very well.
In a circuit where a given resistor is the only component, it drops all the voltage in the circuit. It "feels" all the voltage in the circuit. In a circuit where there are 2 resistors of equal value in series, each one drops or "feels" half of the applied voltage. (The sum of the voltage drops equals the applied voltage.) As you work more with simple circuits using resistors in different arrangements with a given voltage source, try thinking of the voltage drop of a resistor as the voltage it "feels" when the circuit is energized.
According to ohm's law resistance is equal to voltage divided by?
The equation you are looking for, R = E/I, is derived from the definition of the ohm, not from Ohm's Law. Ohm's Law is properly-called 'Ohm's Law of Constant Proportionality', which states that, for certain (linear) loads, the ratio of voltage to current is constant for changes in voltage. The above equation applies whether Ohm's Law does or does not.
There is a simple equation relating voltage (properly potential difference), current and resistance: V=IR Where V=potential difference, I=current and R=resistance So to answer: I=60/12 I=5
What is definition of residual voltage?
Net voltage in the Neutral of a three phase electrical system is called residual voltage.
A circuit that has only one path for the current is called?
A circuit that has only one path for the current is called a series circuit. In a series circuit, the components are connected end-to-end, creating a single pathway for the flow of electricity. This means that the current passing through each component is the same, making series circuits useful for applications where a consistent current is needed.
Then with a non-linear relationship the conductivity will increase as one increase the forward bias current through the base to emitter junction. Biasing is used for classical transistor amplifier applications. Biasing is required to have the transistor half way saturated for Class-A amplification or barely switched on for Class-B power amplifiers. If a Class-B amplifier is not biased, then the lower 0.7V of the audio or sine wave will not be amplified causing crossover distortion. When you bias it correctly, the distortions will be gone, since the entire half wave will then fit into the on state of the transistor. If a Class-A amplifier is not correctly biased, premature clipping on the positive or negative part of the wave will occur.
Biasing may be used for other applications as well, such as photo transistors, internal construction of IC's such as op-amps.
What is attenuation in communication?
loss of signal strength as distance increases The reduction of signal energy during transmission.
What is the impedance of a full wave dipole?
Typically, the desired frequency of operation is known, and the purpose of the
calculation is to identify the best size for the dipole antenna. The most often
used formula to find that length is
Length = 468/frequency, MHz feet, or 142.6/frequency, MHz meters.
That gets you close, but some tweaking and trimming is usually required after
construction, because some of the characteristics of the installation, such as
the antenna's height above ground and method of supporting its ends, affect
the antenna's properties.
The wavelength corresponding to that frequency is
Wavelength = 300/frequency, MHz meters, or 984/frequency, MHz feet.
The way your question is written, it appears that you already have the antenna, and
now you want to know the frequency at which it will operate best. I must tell you
how peculiar this sounds to anybody in the radio business. But I'm here to answer
questions if they make sense, not to judge how impractical or useless they may
actually turn out to be. So here goes:
For the first time ever, you've just noticed a horizontal wire hanging between two
trees in your back yard. Rather than simply tearing it down, you're curious to know
the frequency/wavelength at which it could most efficiently transmit/receive when
operated as a half-wave dipole. So you measure its length somehow, and call the
length ' L ' .
-- If you measured ' L ' in feet, then the best frequency to try first is 468/L MHz.
The corresponding wavelength is 2L feet, or 0.6096L meters.
-- If you measured ' L ' in meters, then the best frequency to try first is 142.6/L MHz.
The corresponding wavelength is 6.562L feet, or 2L meters.
What is saturation and active region in a transistor?
The output current of a transistor is controlled by the current in the 'base' input: Increasing the control current will increase the output current in a more or less linear fashion.
In the saturation region, this is no longer true: The transistor is nearing the limits of how much current it can conduct, so increasing the control current further has little or no effect.
When using a transistor as an amplifier, you want to stay away from the saturation region as it would distort the signal you are amplifying.
When using a transistor as an on/off switch, as in digital circuits, being in the saturated region is 'on' and a normal mode of operation.
Why transformer cannot work on dc voltage?
In DC, flow of current is controlled by resistance only where as in AC it is done by Impedance which is combination of Resistance , inductive and capacitive reactances.
Reasons:
- In transformers resistance of the transformer's core windings are very low due to which if you will connect transformer across DC supply then it will draw a heavy current which will burn out is winding and it may damage the equipment too.
- Transformers works of the principal of Induction (Mutual/Self) that is possible in AC only because in DC there is no induction therefore even if transformer's windings anyhow withstand with DC there will be no voltage output at output terminals of the transformer, therefore it is useless to connect transformer on DC supply.
aperture distortion,it occurs due to flat top sampling.
when the flat top sampling are observed through a finite duration rather than
infinitisimal time is called aperture distortion.
Can a waste gate increase horsepower?
Yes a wastegate can increase horsepower. A wastegate is a valve that controls the amount of exhaust gas that flows past the turbine in a turbocharger which is a device that increases engine power by forcing more air into the combustion chamber. A wastegate is used to regulate the boost pressure created by the turbocharger and to prevent the engine from producing too much power. Increasing the boost pressure can increase the power output of an engine which in turn increases the horsepower.
There are several ways to increase the boost pressure in a turbocharger but the most common method is to install a wastegate. The wastegate is used to regulate the amount of exhaust gas that is allowed to flow past the turbine. This can be done by adjusting the size of the wastegate opening or by increasing the amount of pressure being applied to the wastegate. Depending on the type of setup the wastegate can be adjusted to increase the boost pressure and thus increase the power output of the engine.
Installing a wastegate can also help to improve the efficiency of the engine. By controlling the amount of exhaust gas that is allowed to pass through the turbine the engine will be able to operate at higher RPMs without having to work as hard. This can result in improved fuel economy as well as improved performance.
When installing a wastegate it is important to make sure that the wastegate is properly sized and installed. If the wastegate is too small the boost pressure will not increase as much as it should and the engine will not produce as much power. On the other hand if the wastegate is too large the boost pressure will be too high and the engine will run too hot. It is also important to make sure that the wastegate is connected to the turbocharger properly and that all of the connections are tight and secure.
In conclusion a wastegate can increase horsepower by increasing the boost pressure in a turbocharger. However it is important to make sure that the wastegate is properly sized and installed in order to ensure that the desired results are achieved.
Why Need for carrier frequency stability?
Explain the need for carrier frequency stability in radio transmitters?
One cultural bias example that is particularly prevalent nowadays is the notion that "all Americans are lazy and fat." The problems with that bias is if a person is American, fit, and works hard, then they must automatically be a foreigner since they do not fit into that role of "an American slob."
Metals have "free" electrons, the free electrons in metals help to transfer heat together with the vibrating atoms.
What is epabx how it works and what is main content of?
EPABX stands for Electronic Private Automatic Branch Exchange.
EPABX is a telephone exchange that serves a particular office / institute or area, as opposed to one that a telephone company operates for many businesses or for the general public.
It make connections among the internal telephones of a private organization and also connect them to the Public Switched Telephone Network (PSTN) via Trunk lines. The general term "Extension" is used to refer to any end point on the branch.
To establish an EPABX network, main contents are:
1. EPABX Block
2. Tag Block
3. External Telephone Connection
4. Jack Panels
5. Face Plates
6. Telephone Setup
Snarled program logic is unstructured logic, also known as "spaghetti" logic. Compiled machine code is the ultimate example of snarled program logic. Although spaghetti code is more compact and efficient than structured code, it is extremely difficult to both comprehend and maintain. Hence we use structured programming languages to provide a high level of abstraction between the logic of the programmer and the snarled logic of the machine-dependant code.
To be specific, a voltmeter is a tool used especially in science to calculate the differences of electric potential of two circuits. There are quite a few types of voltmeters and they are also quite portable which may be ideal for traveling with.
An astable multivibrator [also known as an oscillator] is a circuit built so that it does not come to rest in one single state but switches between them continuously.
What would happen to the output of an ac generator if one of the stator windings has open?
There would be a significant decrease in the output of the generator. Depending on the type of generator, it could stop working altogether.
A component video signal uses three separate channels or wires to deliver a complete color television signal. One of the three carries brightness information, known as the "luma" signal. The color information, known as "chroma" is carried on the other two signals. Component video is used in production and broadcast environments as it delivers the best possible quality. Although broadcast has almost completely moved to digital signals, the signal format is still component. Domestic applications often use composite signals, a single wire that carries both luma and chroma signals although component is provided on some equipment. RGB (red, green, blue)signals are often referred to as component. The two are different and are not compatible.
What is instrumentation system?
As we know that in medical science, anything whose evaluation takes place is called as SUBJECT....and who evaluate the SUBJECT is called as OBJECT..... in man-instrument system man or human body is subject and instruments are object............
Adaptive delta modulation is a analog-to-digital and digital-to-analog conversion technique which is primarily used for voice transmission data and can be used for multiple purposes.
