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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 purpose of the color bands on a fixed resistor?
The colour bands indicate the value and tolerance of the part. The colours are specified in in standards published by the "Radio Manufactures Association" in North America. One (of many) handy pages that help explain how to read the code is here : http://www.radioremembered.org/rescode.htm .
There are many other similar pages out there.
Explain the operation of an EPROM?
Aneprom is a programmable read only memory. It can be reprogrammed many times. Takes ultraviolet rays to erase the EPROM usually minutes However on sun light ultra Violet emission will take years to completely erase it.To program the chip one pin is raised to a hi voltage and whatever data 1/0 on the input will be burned into it where it is determined by the address line. So data will be burned at whatever address is selected. This data will remain embedded until again erased.
A rectangular wave has a 60 percent duty cycle and a frequency of 50 Mhz how long is the signal low?
First of all there is no definition of retangular wave. Maybe your retangular is my square wave. and the answer is inconclusive unless you specify the 40% level.
def main():
showvalue()
def showvalue():
print '12'
main()
How do you Calculate the contact rating of relay for AC and DC?
On the side of the relay there is a name plate that tells you the current carrying capacity of the contacts. It gives you the ratings at different AC voltages and a DC rating of the contacts at different voltages.
Main difference between ac and dc motor?
Dc is an electrical term for direct current. Ac stands for alternating current. As you probably guessed a dc moter uses dc current and an ac moter uses ac current.
P.S. Most home outlets use ac current.
What is minimum size resistor in watts to use with a 9 volt 900 ohm resistor?
Take your pick:
P = V x I (Power = Voltage x Current)
or:
P = V2 / R (Power = Voltage2 / Resistance)
or:
P = I2 *R (Power = Current2 x Resistance)
(the last two equations come from combining the ohms law equation R=V/I with the power equation P=VxI)
In the question above you have resistance and voltage therefore:
P = V2 / R = 92 / 900 = 0.090W = 90mW
(i believe 0.125W is the smallest resistor you can get)
hope that helps
Multivibrators are the regenerative circuits used in timing circuits. The are classified as Bistable Multivibrators, Monostable Multivibrators and Astable Multivibrators.
What is indicating instrument?
An instrument in which the present value of the quantity being measured is indicated is called an indicating instrument.
Reasons of positive axial shift in steam turbine?
Sudden change of load
Sudden drop of vacuum
Sudden drop of Main steam temperature.
What are the different applications of multivibrators?
it is basically used in the timer alaram tat is used in the collage.alo it is used in telephone ckt's for ring tone
Auto correlation and cross correlation?
Auto correlation is the correlation of one signal with itself.
Cross correlation is the correlation of one signal with a different signal.
Yes. When resistors are connected in "parallel" (all the left ends connected together and all the right ends connected together) the effective resistance is always less then the smallest resistor in the group. For example If you connected a 2 ohm in parallel with a 4 ohm the effective resistance is 1.33 ohm. To your question; if you connect N equal resistors R in parallel the effective resistance would be R/N . The formula for calculating effective resistance R of a group R1, R2, R3, ... in parallel is: 1/R = 1/R1 + 1/R2 + 1/R3 + .... Note; write the right side as a single fraction by getting a common denomenator then invert to get R.
Technician A say that the current draw should decrease as the voltage decreases?
Ohm's law states the same thing. E = I x R, substitute numbers for E and I and see for yourself. E = 120, I = 10, R = , now E = 60, I = 10, R = what number times 10 = 60
Pottant is the material, usually some form of silicone, that holds crystalline solar cells in place inside their modules.
