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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 analog signal convert into digital signal?
Because an analog signal takes up more bandwidth than the new digital format. By cutting off the analog signals and offering digital only, it frees up enough space on the network to offer services to a wider range of people. It also includes enhancements to the providers network. For example, faster internet speeds, more TV channels, and more features.
Can A.C MCB be used for D.C. application?
Yes you can use. But, Normally DC voltage is 1/5 of the AC rated voltage of the Breaker. So it means if you have 220 volts rated breaker then 44 volts (round up 48) of DC. Because in AC will go every 10 mS (milli Seconds) to Zero in 50 Hz but in DC no break, so in DC the arc on contacts will go to a long distance as compared to DC which may melt more quickly the contacts than AC. At the same time, better, that the breaker specifications mention DC too.
No. Ohms Law states the relationship between voltage, current, and resistance, not between voltage, current, and charge. (Volts = Amps * Ohms)
Another Answer
Ohm's Law is not a universal law; in fact, it barely qualifies as a scientific law at all, because it only applies in a very limited number of controlled circumstances. Put simply, Ohm's Law states that 'the current in a conductor is directly proportional to the potential difference across that conductor, providing all physical conditions, such as temperature, remain constant'. So, as you can see, Ohm's Law only states the relationship between current and voltage.
Ohm's Law, then, ONLY applies when the ratio of voltage to current is constant for variations in voltage. Put another way, Ohm's Law only applies when the resulting graph of voltage to resistance is a straight line.
Unfortunately, this is rarely the case. For example, if you were to increase the voltage across a conductor, such as tungsten, the resulting increase in current would cause that conductor's temperature to rise, thus invalidating Ohm's Law, and producing a curved graph, rather than a straight-line graph.
So, Ohm's Law does NOT apply to most conductors, or to most electronic devices, such as diodes etc., other than for the straight-line parts of their characteristic curves.
Ohm's Law is frequently, but mistakenly, expressed by the equation, R = U/I (where R = resistance, U = voltage, and I = current). This equation, however, is derived from the definition of the ohm and NOT from Ohm's Law.
What is use of offset null pins in IC?
By connecting the ends of a 10K trimmer potentiometer to the two pins( 1 and 8 of an 8 pin dip OP Amp) and the slider to -supply rail it is possible to null the output to exactly 0 volts. This might be important in a DC coupled amp like a servo driver. Otherwise these pins can be left open.
What are the advantages of using doped semiconductor rather than pure semiconductor?
Doped semiconductors have enhanced electrical properties compared to pure semiconductors, primarily due to the introduction of impurity atoms that create free charge carriers. This doping process increases conductivity, allowing for better control over the material's electrical characteristics, which is crucial for devices like transistors and diodes. Additionally, doped semiconductors enable the formation of p-n junctions essential for various electronic applications, enhancing performance in integrated circuits and photovoltaic cells. Overall, doping allows for tailored electrical behavior, improving efficiency and functionality in semiconductor devices.
How do you work out resistance with voltage and joules?
Resistance of a conductor is defined by the specific resistivity, area of cross section and the length of the conductor. R = rL/A, where R is resistance in OHMs, r is specific resistance, L length in mm, A is area of cross section in sq mm
Can AC supply can be applied to DC coil?
If you apply a DC voltage to an inductor (AC or DC, it does not matter) the current through the inductor will increase with a rate proportional to voltage and inversely proportional to inductance. di/dt = V/L In the ideal case, current would continue to rise to infinity. Since there are no ideal voltage sources, inductors, or conductors, current would rise to the limit of the voltage source's current capacity or to the voltage divided by the resistance of the circuit, whichever comes first. Note that an inductor is essentially a short circuit to a DC voltage. You need series resistance in order for the circuit to remain stable.
How do you find time constant in a RC circuit given electromotive force resistance and capacitance?
T=RC
T=Time Constant
R=Resistance in ohms
C= Capacitance in Farads
Why potential difference at every point in parallel circuit is same?
Kirchof's Law - the voltages are measured between the same starting-point and end-point.
Can a 7.5 volt dc adapter be used for 9 volt dc speakers?
You may get some sound out of the unit but not at the fidelity that the manufacturer designed the speaker to produce.
What is the purpose of a transmitter?
FM GPS Transmitters use radio frequencies to track and locate objects from far away. They are more so common in vehicles and cellphones: http://www.gpstrackingdevice.net/Accurate-Tracking-With-FM-GPS-Transmitter-Devices.html
Relationship between phase and frequency modulation?
Wavelength lambda and frequency f are connected by the speed c of the medium. c can be air = 343 m/s at 20 degrees celsius or water at 0 dgrees = 1450 m/s. c can be light waves or electromagnetic waves = 299 792 458 m/s. The formulas are: c = lambda x f f = c / lambda lambda = c / f
What are the advantages of fp over loc?
Function points (FP) offer several advantages over lines of code (LOC) as a metric for measuring software size and complexity. FP focuses on the functionality delivered to the user, making it more aligned with business value and user requirements, whereas LOC is more about the implementation details. Additionally, FP provides a more consistent measure across different programming languages and development environments, which can help in comparative analysis and project estimation. This makes FP a more effective tool for project management and performance evaluation.
How do you intialize graphic mode in c?
Platform-dependent. For Turbo C, enter initgraph and press Ctrl+F1.
What is the current flowing through the cicuit of a 12 volt battery with a 3-ohm resistor in it?
Voltage (volts) is equal to the current (amps) times the resistance (ohms):
V = I*R
Thus, the current I = V/R = 12 V / 3 Ohm = 4 A.
Why are resistors useful in electric circuits?
The only reason i can think of this making sense is that it makes the calculation for total resistance easier. Other then that i can't see any benefit from having resistors with similar ratings.
The formula for finding total resistance in a parallel circuit is Rt=1/1/r1+1/r2+1/rn...
If all the resistors are the same, you can do the calculation in your head a lot easier.
to make a anoying noise when you walk
Ans.2 The noise comes from a type of shoes called flipflops - no hyphen.
Flip-flops have a variety of uses; the two common ones are
- To act as a 1-bit read write memory, often called a flag
- To divide a series of level transitions (or pulses). One flop will divide by 2. Two flops cascaded will divide by 4. A block of cascaded flops which are wired to reset to zero when a particular state is reached will divide by any desired number.
ANSWER: FLIP-FLOP are THERE to create logical functions in machine language like storing, counting, shifting.
What is the maximum value of a 220 ohm with a 10 percent tolerance?
242 ohms INCLUDES initial tolerance assuming no thermal drift aging etc
What are the safety hazards of electronic circuits?
there are several ways of safety hazards in electronic circuits those are those are -
1- capacitors are dangerous if they charged discharge it before handling.
2- the high voltages are present somewhere in electronic circuits like EHT on television mind these.
3> static charge of body can damage cmos ics don't touch them from naked hand.
4> ground all equipments before using them it will prevent from electric shock.
What happens in the depletion region in reverse bias?
in forward biasing depletion region width decreases and in reverse biasing it increases .
What is HT and LT current and voltage?
A 'bushing' is a tubular insulator used to insulate a conductor that passes, for example, from the inside of a transformer or circuit breaker to the outside, enabling the internal components to be connected to external supply lines.
High-voltage (or 'high tension') bushings have thicker walls and are longer than low-voltage bushings, as they have to withstand higher voltages.
