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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 virtual ground concept?
In case of Operational Amplifier,the voltage gain is very high. So by AV=Vo/Vi we can conclude that Vi is very small quantity.
Approximately we can take Vi=0.
So potential difference between input terminals becomes zero.And in most of the cases we
consider a terminal grounded.So potential of other terminal also becomes zero.
This is called Virtual Ground Concept.
What is stack in microprocessor?
The stack is a region of memory set aside to store register values and operands.
What happens when one light bulb burns out in a series circuit?
All of the light bulbs in the series circuit would go out.
Difference between thick and thin film integrated circuits?
they have differe.nt method of deposition of film of conducting material. Hence, the difference between two is their fabrication process.
Resistors "resist" current flow. The ultimate "blocking" resistor is an open circuit, having a resistance of infinity (for all practical purposes) ohms.
Capacitors also resist a change in voltage drop. For the case of a DC circuit, a capacitor, after reaching equilibrium, will present a DC resistance of infinity. For the case of the AC circuit, a capacitor will allow the AC signal to pass, while blocking any DC bias that might be present.
So, resistors and, in the DC case, capacitors, block current flow.
What is a unlimited texting plan 15 dollars or less?
$15/month for unlimited texting and 10 cents for calling
Why a multivibrator is called a multivibrator?
oscillators could generate various types of waveforms, i.e., sinusoidal, triangular, etc. Oscillators generating non-analog waveform(sinusoidal, triangular are examples of analog waveforms) ,i.e., square or rectangular waveforms are called multivibrators.
Classically, "multivibrator" term was proposed by the Dutch physicist van der Pol, refers to the multiplicity of harmonics in the spectrum of generated oscillations (in this sense a generator of sinusoidal oscillations could be called a monovibrator).
How many volts to make one watt?
Wattage refers to power power is voltage times current.
P = V*I
Therefore, in order to know the voltage you need you also need to measure the current (units of amps).
When are electromagnets used to increase or decrease the voltage of electric currents?
Electromagnets are never used to increase or decrease the voltage in a circuit. These magnets in conjunction with a rotating device (an armature) can create a voltage but the do not have any effect on a voltage.
A change in frequency is a change in what?
A change in frequency is a change in pitch, in terms of sound. try to picture a sine wave in your mind. When you lower the frequency of the wave, it stretches the sine wave out (Which is how the pitch of the sound is lowered. I'm assume that you're question is about Audio.) For example, if you had a sound wave at 440Hz (And is aslo the musical note "A" on the center octave), and you changed its frequency to 329.63Hz, it would then sound lower in pitch (The musical note of "E") I hope that helps ;)
~Mitch
What different between band gap silicon amorphous with crystaline?
Amorphous Silicon (a-Si) has band gap of about 1.7eV, whereas crystalline (c-Si) only has a band gap of 1.1eV
When can an analog signal be reconstructed from its sample values?
An analog signal can be reconstructed from its sample values when the samples were taken often enough.
Exactly how often is "often enough" depends on how accurately you want to reconstruct the original. The crucial question is "what is the highest frequency of interest in the original signal?". The usual rule of thumb is to sample at a minimum of twice that frequency.
Beware. If you want to sample a piano playing a concert pitch A (440 Hz), your sample rate will depend on why you want to do it. If you just want to know that the piano played A rather than, say, middle C, a sample rate of 1KHz would do. However, if you want to be able to identify the instrument as a piano, a 1 KHz sample rate won't do at all. When the orchestra tunes up, and the oboe gives an A, it doesn't sound anything like a piano. The fundamental note is 440 Hz just like the piano, but every musical instrument produces multiples of the fundamental, called harmonics. It is the number of harmonics and their relative amplititudes which gives the instrument its distinctive sound. These are the "highest frequency of interest".
How regenerative repeater work in pulse code modulation?
Regenerative Repeater is used for the PCM (Pulse code modulation ) it amplifies the signal because the effect of the channel over the signal .
What is meant by attenuation in Optical Fiber Communication?
When an optical signal of a given wavelength travels in the fiber it looses power. The amount of loss of power per Km length of fiber is called its attenuation.
A=10*LOG10(POUT/PIN) dB/Km
Where POuT is optical power after 1 Km
PIN is th epower launched in the Fiber.
P = IV
I = V / R
I = 14 / (9 * 4) = 14 / 36
IV = (14 / 36) * 14
IV = 5.444 Joules
How do you connect a diode across a 24 volt valve?
Use of a diode across a DC electromagnetic device, such as a valve, is to counter the reverse voltage (EMF) caused by the collapse of the magnetic field when the power is turned off. If the diode were not present, the reverse voltage can become very large, even to thousands of volts or more, and it can damage the associated circuitry.
In this application, the anode is connected to the negative side, and the cathode is connected to the positive side. When power is applied, the diode does not conduct. When power is removed, and the inductor attempts to maintain the current flow by generating a reverse voltage, the diode conducts until the magnetic field collapses.
With a 10mA forward bias current, if the voltages at the anode and cathode of a diode in a circuit are found to be the same, then the diode most likely to be shorted.
