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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 are npn transistors used more often than pnp transistors?
The primary reason that NPN transistors are used more often than PNP transistors is that they usually operate faster (at higher frequencies) because the mobility of the current carriers in NPN transistors (electrons) is much higher than that of the current carriers in PNP transistors (holes).
What is Resistance of 20 ohms and 10 ohms?
Well, the total circuit resistance depends on the type of connection.
If the two resistances (or any number of resistances) are connected in series, IE. one resistance end is connected to one end of another resistance, the the circuit total resistance is the sum of the two resistances. say two resistances r1 and r2 are connected in series the total resistance is r1+r2 (in this case its 30 ohms).
If the resistances are connected in parallel IE. both the ends of a resistance are connected to both ends of another resistance then the total resistance in this case shall be (r1*r2)/(r1+r2) ,( that is 6.67 ohms in given case).
If voltage is increased in a circuit what happens to current series and parallel respectively?
In this case current flows from a high voltage to a lower voltage in a circuit.
If the current in a 75 watt light is 6250mA then what is this in amperes?
Watts and amps measure different aspects of electricity and are not interchangeable.
What are the applications of bandstop filters?
for...example..you..have..frequency...range...of..f1-f2-f3-f4,
now..your..work..requires..you..to..avoid..frequency..band..of..f2-f3....
what..you..will..do???you..have..to..avoid..or...reject..that..particular..band...so..you..will..
have..to..design..a..filter..circuit..according..to.the..requirement..
Does resistance depend upon current?
The higher the resistance the lower the current flow. It restricts the flow of electrical current. The resistance will not depend upon the current. The current flow will depend on the resistance.
Can we use positive feedback in amplifiers?
Yes because an amplifier with positive feedback is an oscillator.
WHY does adding more loads in a parallel circuit increase the current?
Adding more loads in a parallel circuit increases the current because of Kirchoff's voltage and current laws, and because of Ohm's law...
1. Kirchoff's voltage law states that the signed sum of the voltage drops around a series circuit is zero. A consequence of this is that the voltages across elements of a parallel circuit must be the same.
2. Ohm's law states that current is voltage divided by resistance. Since the voltage across each new parallel element is the same, the current in that element is known. A consequence of this is that each additional element does not change the current in the other elements.
3. Kirchoff's current law states that the signed sum of the currents entering a node is zero. A consequence of this, and 1 and 2 above, is that the currents added by each parallel element increases the total current entering the set of parallel elements.
Reading this question, one kind of has to guess what's being asked. Here's a statement
that may or may not be helpful to the questioner:
A series circuit is one in which there's never a point where the current has to decide
which path to take. There's never a point where the current can split, and there's only
one possible route all the way through the circuit.
In a series circuit, the magnitude of the current is the same at every point.
Are wind turbines harmful to your health?
Not usually, and not directly. But some wind turbines are noisy, and if someone has a house nearby that does not insulate against sound very well, the noise may keep the residents from sleeping well. This in turn could cause health problems. ( The noise from traffic on a highway is much worse than the noise from a wind turbine.)
What are two things that can change the amount of current that flows?
voltage and resistance
There is also temperature.
Why LV side is shorted in short circuit test?
Transformer short circuit tests are used to determine the impedances (positive and zero sequence) of the transformer. A simple explanation: to do this one winding is shorted, and voltage is applied to another winding to circulate the normal full load current of the transformer. The impedance of the transformer is the applied voltage divided by the induced current.
If one winding was not shorted, the voltage divided by induced current would not give the impedance of the transformer - the induced current would be much lower, giving a much higher impedance measurement that would be essentially meaningless.
What are the two common materials used as intrinsic semiconductor?
- silicon
- germanium
- boron nitride
- aluminum phosphide
- gallium arsenide
- indium antimonide
- boron phosphide
- boron arsenide
- boron antimonide
- aluminum nitride
- aluminum arsenide
- aluminum antimonide
- gallium nitride
- gallium phosphide
- gallium antimonide
- indium nitride
- indium phosphide
- indium arsenide
- etc.
There are also other types of semiconductors, like copper oxide, selenium, cadmium sulfide, and lead sulfide. However the properties of these semiconductors are harder to control than those listed above, thus they have few uses in modern electronics.
Carbon in the form of nanotubes or high purity diamond thin films also offers promise as a semiconductor. It should work at much higher temperatures than other semiconductors can, but fabrication problems remain to be solved before it can be used in practical devices.
How to identify a 470 ohm resistor?
Resistors are color coded to denote the value of the resistor as well as the multiplier. In your case a 470 ohm would be colored as Yellow Violet Brown corresponding to 4, 7 and a multiplier of 10^1.
What is the purpose of a résumé?
It describes your education, abilities and previous employment and is usually attached to a job application - to give further information about you. It is your representation of your knowledge and skills that qualify you for employment.
In England a resume is known as a C. V. (Curriculum vitae)
Resumes are scanned in about 15 seconds or less, so you have to make a good first impression. There are different styles of resumes so it's important to make the right choice. The ultimate aim is to receive further consideration for an available position.
"IC" in the world of electronics means "Integrated Circuit"
What is the difference between the inrush current and the fault current?
Magnetizing inrush current has bigger 2nd harmonics compare to short circuit current.
the second harmonics content is about >60% of fundamental harmonic.
magnetizing inrush current happened when we energised the transformer, and short circuit current happened if there is a short circuit between different alive phase.
Why negative voltage is used in BTS in GSM system?
Because 2 terminal comes out from the battery and through red wire we ground the +ive terminal so that possibility of noise interference will get zero....noise occur only in the +ive terminal.....thats why we use -ive voltage.
If the resistance increases what will happen to voltage and current?
If you have a simple circuit. For eg: One voltage source and one resistor, then the voltage of the circuit will always remain the same, the current however will decrease following Ohms' Law V=I*R.
If we have a current source instead of a voltage source, we are forcing the current to be a certain value so if we increase the resistor value the current will remain the same but the voltage will increase.
What logic gate might be called the all or nothing gate?
AND gate is an all or
nothing gate because in able to have an output of logic 1,all of the input must be all logic 1 or else the output will be nothing or simply logic 0.
What types of bulbs used for street lighting?
You may use electronic bulb of any kind in your street. It is entirely depends upon your choice but the main thing you should keep in mind that their light should be of white color like tube light.
Because it will be more difficult to see things in some other color other then the white one.
Why is the power of a light bulb large?
Most light bulbs waste energy as heat. Even LEDs. Large light bulbs require more power.
Why don't we supply to DC to the transformer?
When we give d.c supply to a transformer the primary winding will burn because constent flux will be will be produced which doesnt link with secondary so max current will circulate on primary winding only
