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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 capacitance of parallel plate capacitor?
We know the Electric Field, E, is equal to:
E=V/l, where V is voltage, l is distance.
V=E*l
Capacitance, C=q/V, and C=q/(E*l)
Hence capacitance is inversely proportional to the distance separating the plates.
What are some alternatives to circuit boards for electronic circuits?
Before circuit boards, we used point-to-point wiring between components that were usually mounted onto a metal chassis or plugged in to sockets.
It's a low-tech method still used in prototyping, for very small production runs and by hobbyists.
Individual transistors developed into integrated circuits (chips), but these were still mounted onto some kind of circuit board/chassis. The advance was to integrate *very many* transistors (millions-plus) into Very Large Scale Integrated (VLSI) circuits, such as microprocessors and memory chips.
So....
1. A low-cost, short-run alternative is point-to-point wiring,
2. The high-technology alternative is to integrate many//most/all functions into a single ship.
How do you derive expression for diffusion capacitance?
Diffusion capacitance is the capacitance due to transport of charge carriers between two terminals of a device, for example, the diffusion of carriers from anode to cathode in forward bias mode of a diode or from emitter to base (forward-biased junction in active region) for a transistor. In a semiconductor device with a current flowing through it (for example, an ongoing transport of charge by diffusion) at a particular moment there is necessarily some charge in the process of transit through the device. If the applied voltage changes to a different value and the current changes to a different value, a different amount of charge will be in transit in the new circumstances. The change in the amount of transiting charge divided by the change in the voltage causing it is the diffusion capacitance. The adjective "diffusion" is used because the original use of this term was for junction diodes, where the charge transport was via the diffusion mechanism. See Fick's laws of diffusion.
To implement this notion quantitatively, at a particular moment in time let the voltage across the device be . Now assume that the voltage changes with time slowly enough that at each moment the current is the same as the DC current that would flow at that voltage, say (the quasistatic approximation). Suppose further that the time to cross the device is the forward transit time . In this case the amount of charge in transit through the device at this particular moment, denoted , is given by.
Consequently, the corresponding diffusion capacitance:. is.
In the event the quasi-static approximation does not hold, that is, for very fast voltage changes occurring in times shorter than the transit time , the equations governing time-dependent transport in the device must be solved to find the charge in transit, for example the Boltzmann equation. That problem is a subject of continuing research under the topic of non-quasistatic effects.
What happens to zener current after the breakdown voltage is reached?
After breakdown voltage is reached in a zener diode the current increases drastically.
Why is modulation necessary in radiobroadcasting?
Modulation in radio broadcasting is important because it is necessary to adjust the carrier signal so that the information in the modulating signal can be broadcasted. You must have modulation in order to transmit thru a radio wave.
What is needed to drive 8 ohm speakers from TV?
youre mpother was a hamster and your father smeltof elder berries
Why is BC547 better than SL100 transistor?
Bc100 is an npn transister. if we know vlsi/cmos u will come to know about npn & pnp configurations.
Why is it not suitable to use a soldering gun to solder modem electronics component?
Solder guns as a rule have wider tips than soldering irons/soldering pens.You might not be able to reach just the spot that you want to with a solder gun given the size of the components, and how tightly packed they are on a modern circuit board.
Many modern components, such as integrated circuits, will be damaged by the high heat levels produced by soldering guns.
The relation between resistance R, Current I and voltage V is:
R= V/I
Therefore: 60 = 12 / I <=> I = 12 / 60 = 0.2 amp
As the circuit must be a closed loop, the current passes through both the source and load. If it was not a closed loop no current could flow anywhere.
its fantastic,pretty and everything else!! hoope it helps!
Can LED lights flash on and off?
yes i think so
Yes, there are flashing l.e.ds. An ordinary l.e.d. can, of course, be flashed on and off by interrupting the current through it. There are products such as the LED-FLASHDIM available from LED-SUPPLIES.COM that will enable you to control how LED strip lighting flashes and at what speed and brightness levels
Why epoxy lens used in led diodes?
Epoxy lens consists of light scattering particles which increases the brightness of LED.
When performing a flip test to generate a topic what do you do?
scan through magazines and jot down answers
What is shunt and series motor?
A series motor is one in which the field windings are in series with the armature windings. So the torque is proportional to the square of the supply current.
'Shunt' is an archaic term for 'parallel'. So a shunt motor is one in which the field winding is in parallel with the armature windings. So the torque is proportional to the supply current.
How much power is dissipated by a circuit with 15000 ohms of resistance and 10mA of current?
15 KOhms times 10 mA = 150 volts.
150 volts times 10 mA = 1.5 watts.
The transmitting signal bandwidth is much wider than would normally be necessary to transmit the information
Some influence other than the information being transmitted is used to determine the transmitting bandwidth
What is the significance of dc load line in a transistor?
A load line is used in graphic analysis of circuits, having both linear and non-linear parts, representing the constraint the other parts of the circuit put on the non-linear transistor. It represents the response of the linear circuit connected to the transistor. The DC load line describes the DC operation of a transistor graphically.
How can convert voltage source into current source?
Take the internal series resistance of the voltage source and make it the internal parallel resistance of the current source. Then compute using Ohm's law the current of the current source to be equal to the maximum current the original voltage source could supply a short circuit load.
Note: the two sources are equivalent.
Transmission power cables are designed by current carrying capacity.
Why shunt resistance used in ammeter and why is it connected in parallel?
An ammeter's coil requires very little current for full-scale deflection (fsd). So, to measure a current above its fsd value, most of that current must be allowed to bypass the coil. This is achieved by placing a very low value shunt resistance in parallel with the coil ('shunt' is an archaic word for 'parallel').
construction and working of semiconductor laser
