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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
Why current limit for programmable logic controller is 4-20ma?
4-20ma is an industry standard for signalling in a process monitoring and control environment. 4ma is one end of the range. 20ma is the other. If the receiver sensed 0ma, it would conclude that the circuit is open, and raise an appropriate alarm.
How do you check to see if the octane adjust circuit is open?
First you locate the connector. On my 94 ford explorer it is behind the air breather. It is a two wire connector that doesnt really connect to anything.
It may have a shorting bar installed in the plug or it might have been removed. If removed (pins not shorted together) this simply retards the timing 3 degrees to eliminate any engine pinging. Mine was removed before I bought it and have been driving without it for years...
Hope this answer has been of some help...
KB
What is the element law of a capacitor in frequency domain?
The element law of a capacitor in frequency domain is based on Ohm's Law, which is capacitance times voltage is equal to current. The higher frequency, the lower the capacitance and vice versa.
Can TVs diode can be connected in series to increase the surge current?
No. By Kirchoff's Current Law, components in series all see the same current.
What is the necessity of Q point in BJT study?
selection of q-point is necessary in amplifiers,because if the q-point is not in the middle of load line the output may be clipped i.e not in the power supply range.
What is the difference between digital terrain model and digital elevation model?
DTM = Digital Terrain Model is a digital representation of the sloped contour surface of the earth. Surface features, such as man-made objects and vegetation, are not included.
DEM = Digital Elevation Model is a digital representation of the sloped contour surface of the earth. Elevation data is included, along with surface features such as man-made objects and vegetation.
To answer this question, you need not only Ohm's law, but also Kirchoff's current and voltage Laws.
Kirchoff's current law say the current at every point in a series circuit is the same. Lets call that current i.
Ohm's law say voltage is resistance times current. That means the voltage across each resistor R1 and R2 is V1 = R1i and V2 = R2i.
Kirchoff's voltage law says that the signed voltage drops around a series circuit add op to zero. This means that the voltages V1 and V2 must add up to be be equal to 12. This means that R1i + R2i = 12. This means that i = 12/(R1 + R2). But, hey, you say, this is just Ohm's law! This means that the current through the circuit is 2A. It also means that the resistance of two resistors in series is simply the sum of their resistance.
Now that we know the current, we can calculate each resistor's voltage. V1 = R1i = (2)(2) = 4, and V2 = R2i = (4)(2) = 8. Crosscheck 4 + 8 = 12, so the two voltages do add up to twelve volts, as expected.
In summary: The current through both resistors is 2A. The voltage across the 2 ohm resistor is 4V. The voltage across the 4 ohm resistor s 8V.
It is a a timer of very stable timing if everything else is stable. It widely use for that reason it is ab 8 pin dual in line pin configuration, The design is widely available from manufactures and Internet pages.
Do wifi routers wear out over time?
All equipment does. To prolong life of your router make sure that it's in cold, dry place in minimum of dust.
How does the number of bulbs affect the amount of electrisaty in a circuit?
Adding additional lamps has no effect on the supply voltage supplied to you home. If the lamps are connected in series, then the sum of voltage-drops appearing across each lamp will equal the supply voltage. If the lamps are connected in parallel, then the voltage across each lamp will equal the supply voltage.
Why not replace a fuse with a steel nail?
A fuse is used for protection. If you replace it with a nail, you give up the protection.
If the fuse blew, there was a reason, and the fuse protected you from the results of
what would have happened if it had not blown, like such minor inconveniences as
your TV set getting blasted beyond repair, or your house burning down.
Why cb and cc configuration are not preferred as an electronic switch?
Common emitter is the preferred circuit because the collector voltage drops to a well defined low value when the transistor is 'on', therefore it absorbs only a small amount of power.
Is diode characteristic symmetrical?
Absolutely not. An ideal diode's characteristic would be perfect conduction in the forward direction and perfect insulation (no conduction) in the reverse direction. Silicon diodes come respectably close.
What would happen if the direction of the current through a hall probe is reversed?
The idea is that the magnetic field of the device reacts with the external magnetic field. If the current is reversed, the magnetic field would also be reversed, and the reading would be the opposite.
How do you accelerate electrons?
A good way to accelerate electrons is with voltage. The higher the voltage, the more acceleration. Vacuum tubes do this. Like the cathode ray tube (or picture tube) in a conventional television. Electrons stream from the electron guns at the back of the tube to the phosphor coating on the inside of the face of the glass in front. The intervening space is highly evacuated. Electrons scatter terribly when striking anything, even gas atoms in air. We can really accelerate the electrons when we hit them with good ol' high voltage. In an x-ray generating tube the effects are even more dramatic. Amazing what a few extra tens of thousands of volts will do to speed the little guys up across the evacuated space between the elements of the x-ray tube. Oh, but there's a problem. Once speeded up like that, the electrons will eventually slow down by scattering. And when the highly accelerated electrons in the x-ray tube strike the metal target plate, they generate (surprise!) x-rays. And x-rays aren't to be fooled around with. They are penetrating ionizing radiation. There are linear and circular particle accelerators that can ramp up the speed of these little guys much more than can be accomplished in a vacuum tube, but it's hazardous work. More energetic x-rays can be generated by blasting a target in an accelerator with high speed electrons, and shielding in the target buildings of these facilities is yards thick. As an aside, particle accelerators are usually used to speed up protons, antiprotons and heavy ions and slam them around. Particle physics requires more work in those areas. Electron scattering is understood a little better than other aspects of nuclear physics, so there are limits on the amount of research using accelerators to speed up electrons. Think about it this way. An electron is to a proton something like a table tennis ball is to a bowling ball. Which one do you want to slam into stuff to see what happens, hmm?
Resistor and capacitor built circuit for alarm switch?
I wanna use resistor , capacitor and amplifier 7173 for switch alarm circuit. How can i choice resistor and capacitor value because i wanna use 24V DC.
To test a diode, you can do a variety of tests. The easiest may be measuring the resistance across the leads of a diode. One side should read very high resistance, over 1 megohm, while the other should read a moderate amount of resistance, maybe a few hundred thousand ohms. This is a sign that a diode works. If both sides read very high resistance, the diode is open. If both sides read very low resistance, then the diode is shorted.
If a ac circuit was a captive circuit you would know that in that circuit the current?
In a capacitive circuit, you must first calculate the capacitive reactance (Xc) This is done by 2 x Pi x frequency x the value of capacitor. Then divide one by the answer. This will give you the capacitive reactance in ohms. You can then apply ohms law to find the current. So eg: A 10 ohm resistor is in series with a 150micro farad capacitor across a 230v 50Hz supply. find circuit current. So 2 x pi x 50 x 150E-6(means x10-6 on calc) 2 x 3.14159... x 50 150e-6 = 0.047123889(ans) Now 1/Ans = 21.22 ohms. So you can now add the 21.22 ohms and the 10 ohms together giving 31.22 ohms. This is the total circuit resistance. Now apply ohms law I = V/R So I = 230/31.22 = 10.83 Amps!
What makes cathode-ray tubes dangerous?
Cathode Ray Tubes are potentially dangerous because they are vacuum sealed and can implode. This can cause the shattered glass to fly outward and also exposes the toxic coating inside of the tube.
Which types of fiber optic cable would have a core size of 8nm and a cladding size of 125nm?
Single-mode Fiber
How can an SCR be made to conduct?
An SCR has three legs. The anode, cathode, and gate. The control voltage sent to the gate will allow the SCR to conduct.
