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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
(R1 * R2) / (R1 + R2) = 2 Parallel
R1 + R2 = 9 Series
Treating the two as simultaneous equations, and substituting for R1:
((9-R2) * R2) / (9 - R2 + R2) = 2
R2^2 - 9R2 + 18 = 0
Solving the quadratic, we get:
R2 = 6 ohm R1 = 3 ohm
Which you can check by substituting back into the original equations.
What is functions transistors?
Transistor amplify and switch electrical power and electronic signals. These are made of semiconductor material with three or more terminals used to connect to an external circuit.
Do 1080p TV sets convert 1080i signal to 1080p format?
All LCD displays use progressive scanning, namely the whole frame is built up line by line rather than odd lines followed by even lines. Therefore, by default, 1080i will be converted to 1080p, but at a frame rate of 25Hz or 29.97Hz. 1080p sets take 1080i cable or satellite signal and convert (deinterlace) it, creating a progressive scan, meaning the picture is painted from the top to the bottom line (there are 1080 such horizontal lines) in a single pass, and this process (in the US) happens 60 times per second. 1080p is normally run at 50Hz (Europe) or 59.94Hz (North America). 1080i is normally half that frequency. Even if the signal is converted from 1080i to 1080p, there is no additional picture information and therefore, little is gained by the conversion. If the television actually does the conversion, it is worth doing a comparison between converted and unconverted to see which produces the most pleasing results.
What is the main advantage of digital transmission over analog transmission?
digital signal is less susceptible to signal degradation due to the nature of it's transmission signal which is either on or off and therefore less errors occur as analog is prone to signal degradation and loss that is why digital tv is crisp and clear and analog is somewhat blurry in comparison, also with higher bandwidth achievable by digital transmission more data is able to be transmitted.
How do vegetables conduct electricity?
its cuz they r so awesomely electric if u eat an aple u can get shoked and die
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The vegetable to conduct electricity it must contain free ions like in lemon, which contains free ions as it is acidic.
There are many types of diodes that are used for different functions in electronics. The most common types include the laser diodes and the light emitting diodes (LED).
True or false in a series circuit circuit current is the same throughout the circuit?
A series circuit only has one loop
What is the name of A variable resistor with two terminals?
hi, the center terminal (attached to the wiper contact) tied to one of the ends????
How do you find the value of a zener diode?
It is depend on your requirement .suppose you need a voltage regulator of 5V than you need 5V Zener diode.
What is difference between signal and frequency?
A Signal is the data being transmitted from one device to another, this includes (but not limited to) binary serial data, pulse width modulation (PWM), sound. The waveform is the shape of the transmitted signal, serial data and PWM would take on a square wave waveform whereas sound from a speaker would appear (generally) as a sinewave.
Not much a of difference between the two, but that is because the two are mutually inclusive to each other.
There are many types of antennas, to many to mention, here is a list of the most commonly used:
Unidirectional Types:
First the most common is the, 1/4 wave whip.
Following types is popular for CB and Ham
The 1/2 wave dipole, two 1/4 wave wires or whips in line and center fed
1/2 wave folded dipole, two 1/2 wave wires inline folded back to the center also used for FM reception.
1/4 wave ground plain, a 1/4 wave whip with 3 or more horizontal ground plain elements (Balanced)
1/2 wave ground plain, a 1/2 wave whip with 3 or more horizontal ground plain elements (Balanced)
5/8 wave ground plain, a 5/8 wave whip with 3 or more horizontal ground plain elements but it need L/C turning where the transmission line enters the antenna at the bottom to balance it
Semi Directional
The radio ham's use the long wire antenna for long wave medium and short wave, it is a full wave length of wire, spanned horizontal between two poles or even trees or buildings center or end fed where the transmission line is connected to the center or the end of the wire.
The inverted V, is two 1/2 or 1/4 wave wires spanned from the top of a pole in an inverted v and anchored to the ground.
Directional types:
Multi element Yagi, very popular with radio ham's and TV reception
The quad loop, or cubical quad, also popular under radio ham's
The helical coil that is very popular in the higher frequency range because of it's compactness.
The Parabolic disk that is used mostly for WiFi, microwave and satellite communication
The Printed PCB loop that is used in remote controls and cell phones, it is a printed track on the PCB in many configurations and shapes, it is also used for blue tooth dongles Etc.
What is the difference between open loop and closed loop gains of an op amp?
A: Usually by looking at the specification for that op-amp and there will be accuracy deviation from device to device. To use it open loop is practically impossible all it tells from specification that there will be enough gain when the loop is closed and the max frequency available
What is a typical advantage of CMOS over TTL?
TTL stands for Transistor-Transistor-Logic. N-MOS is a type of a metal oxide semiconductor technology. TTL is faster, but generally uses more power. MOS based devices are slower, they and they use less power. Speed is an issue when dealing with high speed data processing.
Which circuit has different parts of the circuit on separate branches?
Any circuit that even has more than one branch is a parallel one.
What is the function of gate in FET?
u can think of it as two switches(a,b) in series if one is open current won't flow
or a*b
a b y
0 0 0
0 1 0
1 0 0
1 1 1
Is ohms law applicable to all the current carrying conductors?
Ohm's law is a linear approximation for the voltage versus current across a conductor. This approximation works very well for good conductors (like metals) as well as poor conductors (like wood), but not very well for semi-conductors (like Silicon).
The real power in a DC system is the product of voltage & current. P = V * I
In an AC system the power is equal to V * I * power factor. The power factor allows for the fact that the power is less than the volt-amps. This happens when the voltage and current are out of phase, i.e. if they reach their peak value at different points in the AC cycle. In fact if the phase difference is exactly 90 degrees, no real power is transferred at all, although the transmission wires still have to carry current and produce power losses as a result,
The real power (in watts) is defined as the volt-amps times the cosine of the phase difference between voltage and current. Using the convention of complex numbers, the 'imaginary' power (in volt-amps-reactive or VAr) is defined as the volt-amps times the sine of the phase difference.
The three quantities are connected by the Pythagoras formula:
(VA) squared = (watts) squared + (VAr) squared.
Why a transformer designed for a 120V AC input will often burn out if connected to a 120V DC source?
All transformers are designed to work on AC. They do not work on DC.
If you connect an inductor to DC, the current will increase until the capacity of the source or the conductance (1/resistance) capacity of the inductor and conductors is reached. Often, this condition will overheat and destroy the inductor, or destroy the source. A transformer is not an exception, as it is a form of inductor.
What muct be known to calculate current using Ohm's law?
I(current) = V(voltage)/R(resistence) Example : 220 V / 5000 Ohm = 0.044 A (Ampère) = 44mA
An XOR gate is an Exclusive OR gate. The output is 1 if either one or the other inputs are 1. but remains at 0 if both inputs are 1.
A normal OR gate will output 1 if both inputs or either is at 1.
XOR means exclusivly OR, one or the other but not both.
What is measured in amperes a current voltage or an Resistance?
Electrical current is measured in amperes.
What is the use of offset null in an opamp?
A: Any offset whether is voltage or current is an output error to contend with.
What is dynamic range in rf receiver?
Dynamic range in an RF receiver refers to the range of signal amplitudes that the receiver can effectively process without distortion or loss of performance. It is typically defined as the ratio between the largest and smallest signals the receiver can handle while maintaining a specified level of performance, usually measured in decibels (dB). A high dynamic range indicates the ability to distinguish weak signals in the presence of much stronger ones, which is crucial for effective communication in environments with varying signal strengths.
