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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
How is voltage affected in a circuit with a short circuit?
The power supply provide max current and voltage droops accordingly. If the supply has a relatively high internal resistance compared to the short (nothing is truly zero)then V=0, I=max. If the supply is capable of higher currents, then maybe a fuse blows, the wire melts, or a fire starts.
If we're talking 9v little transistor radio battery and 18Guage wire, V=0 and I~200ma.
If we're talking 12V,1000Amp auto battery, the 18G wire melts, voltage barely twitches before the circuit opens.
So it's all relative...
What is an Embedded Processor?
Embedded processor is a part of the computer that follows instructions and carries out action.It is like the "brain" of a computer.
Doppler Radar uses the Doppler effect to determine speed toward or away from the Radar. When a Radar return has a higher frequency than the transmitted pulse, the object is coming closer, and the *difference in frequency determines speed. Lower frequency- object is moving away. This is used by police, and for weather Radar to help detect not only speed but to detect patterns characteristic of tornadoes. Also used for other applications not just military.
You are your own Doppler system using audible frequencies. You can tell when a car, plane, or train is approaching vs moving away.
A half-subtractor lets you borrow out, but not borrow in.
A full subtractor is made by combining two half-subtractor and adding an OR-gate. (lets you both BOR_in as well)
What is an electrical switch that opens and closes under the control of another electrical circuit?
If it is a physical switch, this is called a "relay" or a "contactor". If it is a semiconductor device, it is typically a triac, SCR or a thyristor.
What is the current capacity of two cables in parallel?
It will just be the sum of the current-carrying capacity of each individual cable.
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
How do you calculate how hot a wire can get?
Determine what the wire is made of and look up the melting point of that metal. Once it reaches that temperature it will not be wire anymore but molten metal.
Junction field effect transistor biasing?
When the gate is forward biased, the depletion region is lesser and so the majority carriers(electrons)move freely towards the drain from the source producing high output impedance.When the gate is reverse biased,the depletion region increases(especially near the drain forming wedge shaped depletion)and thus the free flow of the electrons is opposed.hence the output current decreases.The out current becomes zero if the voltage given to the gate is maximum.
What is the analogy of short circuit?
Im searching for the analogies of the following words 1.Overloading 2.Short circuit 3.Circuit Protectors 4.Electromagnetic Induction 5.Len'z law
Use of monostable multivibrator?
it is used for square wave generation.\
ANSWER: Never monostable is a once fire will never toggle again. Meaning it will work once and never again not until a stimuli is present again.
there AS-TABLE oscillators and monostable
Emitter biasing is when you add a resistor between the emitter of a transistor and the 0v rail so that any voltage developed across the emitter will subtract from the voltage on the base and effectively turn the transistor OFF.
We are talking about an NPN transistor and the transistor is an "ordinary transistor" or BJT (bi-polar Junction Transistor). For more information on transistor biasing see: Talking Electronics website.
What is the importance of convolution in system characterization?
Convolution is used in DIGITAL SIGNAL PROCESSING to predict the output of the system with only a few limited number of samples of the input signal and a few limited number of samples of the impulse response of the system. i.e. if we can state that if you know the impulse response of a system then you can predict the behavior of the system for any signal provided it as an input. It also helps to show that the system is stable or not i.e. we say that a system is stable if its impulse response is absolutely summable or square summable (both are sufficient conditions but not necessary conditions).
