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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 Primary function of a voltage follower circuit?
Its purpose is to provide approximately the same voltage to a load as what is input to the amplifier, but at a much greater current. In other words, it has no voltage gain, but it does have current gain.
How do you discharge a 1 farad capacitor?
You could try licking the electrodes but that might hurt. I would just connect the electrodes with a screw driver that has a thick plastic handle, but if u mean discharge it in a circut just use a transistor
Is the Doppler radar the only satellite radar in the world?
Actually the Doppler Radar aka nexrad Next generation radar is not a satellite it is a radar. Satellites are floating around the world in space and Doppler radars are here on earth to monitor weather. As far as I know the Doppler radar is the only weather radar in the world. It is basically the only thing used for monitoring weather.
I the above is not quite correct. Weather radars come in two basic types coherent and non-coherent. The Coherent radar come in Doppler Radar which can be FMCW or Active Pulse Doppler. The non coherent Pulse Radar merely aim high energy pulses at the clouds and display the returned power in a colour display. The coherent version integrates many pulses together to gain a Higher signal to Noise and to detect water drops moving in clouds. That aside, to answer the question which has nothing to do with weather radar, Doppler radar is frequency used in space verticals because its coherent processing gains in achieves help to offset the ranges it operates over, but it is not the only radar technique to be used on satellites and it depends on what the radar is trying achieve. Note that Doppler radar is non a synonymous exclusively of "nexrad Next generation radar".
Who invented the opamp-741 IC?
Nobody invented the op-amp but manufactures decided that an amplifier can be more efficient as opposed to building the same amplifier out of discreet components
Relation between cutoff frequency and bandwidth?
The relation between cut off frequency (fc) and band width is as follows:
fc=Q*B.W
where Q=(fL*fH)^1/2/(fH-fL) Q is quality factor. fL is low frequency. fH is high frequency.
The rate at which charges pass a given point is called?
I know that it is either current (I), voltage (V), or resistance (R) but I'm not sure which one it is.
sorry
How can calculate resistance for negative dc voltage?
Resistance calculations are the same no matter what the polarity of applied voltage. R=E/I Resistance (in ohms) = Voltage (in volts) divided by Current (in amperes)
What is horizontal and vertical amplifier in cathode ray oscilloscope?
The horizontal and vertical amplifier in the cathode-ray oscilloscope are deflection plates. The horizontal amplifier causes the beam to be deflected horizontally at a rate that is uniform. The vertical amplifier causes the beam to deflect vertically.
How does differential pulse code modulation lower the bit rate of transmitted signals?
It signals the difference between successive sample sizes
What is the current gain of an NPN transistor?
It depends on which transistor. Typical values of hFe range between 50 and 400. It also depends on the configuration of the circuit, with hFe being a limiting factor, and most designs providing a gain less than hFe.
Being a math teacher!
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Just about every job requires some math but some that are particularly math intensive include:
Engineer
Accountant
Financial analyst
Actuary
Surveyor
Physicist
Chemist
Software engineer
System engineer
... and of course Mathematician
What precautions should be observed when soldering printed circuit boards?
Never use a acid core solder only resin core should be used and keep the temperature of the soldering iron as low as possible 250 deg C max soldering should be done in a well ventilated space.
Its a security system similar to flash fog, that uses fog to stop a burglar, the intent is that he cannot find what he is looking for (literally). flashfog takes it up one more step, as it also includes a strobe light, that further cuts visibility by a factor of 3.
more info at www.flashfogsecurity.com
Are cross-element Yagi antennas always circularly polarized?
No. They can be circularly polarized with the correct phasing harness, or used as a way to switch between horizontal and vertical polarization with one antenna. No. They can be circularly polarized with the correct phasing harness, or used as a way to switch between horizontal and vertical polarization with one antenna.
How do you Calculate MF in 3-Ph 4 wire energy meter?
how to calculate m.f. of energy meter 3 phase 4 wire h.t. & l.t.
Fullwave center-tap rectifier theory?
The Center-Tapped Full-Wave Rectifier
A center-tapped rectifier is a type of full-wave rectifier that uses two diodes connected to the secondary of a center-tapped transformer, as shown in Figure (a). The input voltage is coupled through the transformer to the center-tapped secondary. Half of the total secondary voltage appears between the center tap and each end of the secondary winding as shown.
Read more: http://www.daenotes.com/electronics/devices-circuits/center-tapped-full-wave-rectifier#ixzz2IVoFQ5erFor a positive half-cycle of the input voltage, the polarities of the secondary voltages are as shown in Figure (a). This condition forward-biases diode D1 and reverse-biases diode D2. The current path is through D1 and the load resistor RL, as indicated. For a negative half-cycle of the input voltage, the voltage polarities on the secondary are as shown in Figure (b). This condition reverse-biases D1 and forward-biases D2. The current path is through D2 and RL, as indicated. Because the output current during both the positive and negative portions of the input cycle is in the same direction through the load, the output voltage developed across the load resistor is a full-wave rectified dc voltage, as shown.
Read more: http://www.daenotes.com/electronics/devices-circuits/center-tapped-full-wave-rectifier#ixzz2IVoev4Vf
What is red red red in resistors?
Two, two, two. Or 22 times 102 ohms, or 2200 ohms, or 2.2K ohms, or just 2.2K, as in, "I've got a 2.2K resistor that needs replacing. It's a quarter watt."
Show you colors for 2.2 kiloohms resistor?
Three red color bands indicate a resistor value of 2,200 ohms (2.2 kohms)
the answer is .017 kilohms. To get this answer you will do a unit converions knowing that 1 kilohms is equal to 1 ohm.
So...
17 ohm * (1 kohm/1000 ohm) = .017
I realize that's a typo, but that conversion should read 1 kilohm is equal to 1000 ohms.
What is the difference between the common logarithm and the natural logarithm?
A logarithm is the exponent to which a number called a base is raised to become a different specific number. A common logarithm uses 10 as the base and a natural logarithm uses the number e (approximately 2.71828) as the base.
