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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 telecom power supply has 48V dc power supply?
because the termination and relays in side the telecoms penal needs for DC supply to continues the protection equipment and relay and purpose of telecoms
What is the salary for a wind turbine technician?
A wind technician's job can range from construction to maintenance and repairs on wind turbines. Some sources on AWEA's web site say that for every 10 wind turbines that are built, 1 new wind tech is needed for maintenance and repair. Reports of what they make vary. Some report a high hourly salary with a low per diem that totals around $65,000 per year on average in places with moderate costs of living in the U.S. Others report a medium salary with a high per diem that can total well north of $75,000 a year. Many employers also carry employee health insurance and issue a company truck for work related duties. As with everything, compensation depends on demand from employers which now appears to be high. If you would like more information on where you can go to get trained, do a google search for California Wind Tech or go to www.californiawindtech.com
Calculate the current where 10 coulombs of charge pass a point in 5 seconds?
Current = charge/time = 10/5 = 2 amperes
Relationship between work and voltage?
Work W=VC where V is voltage and C is charge. WORK is power power= I X V I=CURRENT V=EMF
What do you use DC electricity for?
Direct current (dc) electricity is used in many different things, including for example: digital watches and cameras, cellphones, laptop computers, mp3 players, cars, motorbikes ...
What is an ac and DC generator?
An a.c. generator produces alternating current, whereas a d.c. generator produces direct current.
Can you use a cb radio antenna for am-FM radio?
Sure, you can use it; but it might not do a very good job.
If you're listening to AM, you're receiving between 0.5-1.6 MHz, whereas FM is coming to you at 88-108 MHz.
The CB antenna is designed to be resonant at 27 MHz.
What are advantages of full subtractor?
A full subtractor is advantageous because it can handle the subtraction of binary numbers while accounting for borrow from previous bits, allowing for accurate multi-bit subtraction. It requires only three inputs (two minuends and a borrow-in) and produces two outputs (the difference and borrow-out), simplifying circuit design. This efficiency makes it suitable for digital systems like ALUs in processors. Additionally, full subtractors can be easily cascaded to create larger subtractors for handling more significant binary values.
What are the different symbol of resistor?
Put the resistor symbol ie zig zag. Then put a crossing line with arrow headed at the top.
Why is a transformers power not conserved?
Power is conserved in transformers provided you allow for the heat lost in the transformer. The input power is split between output power, heat loss in the copper-wire windings and heat loss in the iron core. Obviously designers try to make the efficiency as high as possible subject to other constraints, mainly cost, and high-power transformers can have a transfer efficiency of 99%.
What is the difference between modulator and amplifier?
Amplifiers are circuits which transfer an input signal into an output signal.
Oscillators are autonomous circuits powered by a constant energy source.
Oscillators produce a steady state signal e.g. a square wave signal,
a sinusoidal signal or a chaotic signal.
Real world oscillators are non linear circuits.
Linear oscillators are mathematical fiction (a complex pole pair can not
balance on the imaginary axis).
Clarification. Yes, while most oscillators *do* use amplifiers with output-to-input feedback. there are some that do not.
The classic example is the now-obsolete point-contact transistor that exhibited a negative resistance, and could therefore oscillate with a two-terminal tuned circuit and no feedback. The tunnel diode, now also obsolete, also exhibits negative resistance.
Another example is the neon lamp "relaxation" oscillator that relies on a resistor-capacitor circuit's charge/discharge time. This design was also used in early oscilloscope time-bases. The Uni-junction transistor operates similarly.
Disagreements: (i) "Linear oscillators are mathematical fiction". If so, what of (for example) the Wein Bridge oscillator that uses feedback to stabilise its operating point. (ii) Oscillators may be designed to produce an intermittent ("squegging") signal, as used in some lifeboat/search and rescue transmitters, or the super-regenerative receiver.
The (very) basic answer is that an oscillator is an amplifier with a positive feedback path engineered into. This sets up a situation where the feedback returns a bit of the output signal to the input of the stage to "keep it going" and to permit it to sustain the "continuous" output of a (frequency controlled) signal.
All amplifiers can be made to oscillate, and all oscillators amplify. The difference is in how we set them up, which we will do in accordance with what we want out of them.
Clarification: Note that the loop gain must be greater than one for tuned-circuit oscillators. An emitter-follower (with a gain less than 1.0) can be made to oscillate only if the tuned circuit has a voltage gain ("step-up").
To understand the differences it is helpful to look at the similarities. They both need some form of amplifier to work.
The "goodness" of an amplifier is specified by the amount of gain (among other things) it possesses i.e. by how much it amplifies which is measured by seeing how much bigger the output is compared with the input.
All circuits contain feedback paths where part of the output signal finds its way back to the input - some intentional (as in an oscillator) and some unwanted (as in an amplifier).
If we start with an ordinary amplifier circuit and gradually increase the gain of the amplifying bit we will eventually get to the point where the specific combination of that amount of gain and the characteristics of the feedback path result in enough energy travelling through the feedback path to cause the amplifier to become unstable. In other words it oscillates!
The frequency of oscillation is largely determined by the characteristics of the feedback path and when the feedback signal is big enough and is in phase with the original input signal it oscillates.
Why does every radio station have a different carrier frequency?
That's not exactly true. Any frequency you choose has several radio stations on it,
but just not in the same city.
Frequency is what your radio uses to separate the individual stations. If two stations
in the same city transmitted on the same frequency, your radio couldn't separate them.
When you tuned to that frequency, you'd hear both of them at the same time, and you
couldn't understand either one.
Listen to the 27 MHz 'Citizen's Band' some time.
How many amp hours in BXT-65-650 battery?
Difficult. The manufacturers of car batteries have become extremely coy about the performance parameters of their products, probably because they don't want to be forced to meet them by a court.
However, I would suspect that it would be in the vicinity of 30-40 ampere hours. That means that it can deliver 30-40 amps for one hour, so at a voltage of 13.2 volts, that means 396 - 528 watt-hours, ignoring the fact that the voltage decreases as it discharges.
The "Cold cranking" current is a red herring...that is just the current it can supply for a short time, limited by the internal resistance of the battery.
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Battery manufactures have gone to a Reserve Capacity rating which is more realistic than using the Amp-Hour rating. Reserve capacity is the number of minutes that a battery can maintain a useful voltage under a 25 ampere discharge at a temperature of 25 degrees C. To maintain a high RC number a battery requires higher quality cell materials. The RC rating of a BXT-65-650 is 130.
To convert RCR (Reserve Capacity Rating) to Ampere-Hours at the 25 amp rate, multiply RCR by .4167.
What is working principle of electronic energy meter?
The working principle of an electronic energy meter is a device that measures the electronic energy consumed (usually in KWh). It is often incased in glass and has a disk that rotates that measures the amount of power (product of current and voltage) the flows through the meter. The rotation is then integrated over time either by mechanical dials or an electronic digital counter to determine the total energy used.
To simplify reading, many modern ones also contain a type of radio transponder that can be interrogated remotely from the meter reader's vehicle so he/she no longer has to find, read, and write down the value on every meter on his route.
How is total resistance calculated in a series circuit?
If the circuit consists of resistors only, you simply add the values of all the resistors, in ohms.
How do you prevent signal interference with other electrical devices?
It depends on the type of interference, but most shielded cables are used in a copper cable setup. You could also use fiber optic cable if concerned about electrical devices but it might prove too expensive.
Why routing protocol is needed?
Routing protocol is used to dynamically learn routing information so routers know where to send packets. The only other option is to manually define all routers within a network which would be very impractical.
What is the eq of XOR gate having 3 inputs?
Anot + Bnot +Cnot= y not meaning one single line on top of each letter.
Where can one purchase a ear amplifier?
A ear amplifier can be a useful device if one is in a noisy situation and has difficulty hearing what one wishes to hear. Digital ear amplifiers can be bought at Specsavers, despite the name of the shop perhaps suggesting otherwise.
Wlat is the acceptable value for earth loop impedance in a 230V system?
- Maximum earth-fault loop impedance (Ohms) Device rating (A) MCB
type 1 MCB
type 2 MCB
type 3
and type C MCB
type B MCB
type D 5 12.00 6.86 4.80 - 2.40 6 10.00 5.71 4.00 8.00 2.00 10 6.00 3.43 2.40 4.80 1.20 15 4.00 2.29 1.60 - 0.80 16 3.75 2.14 1.50 3.00 0.75 20 3.00 1.71 1.20 2.40 0.60 25 2.40 1.37 0.96 1.92 0.48 30 2.00 1.14 0.80 - 0.40 32 1.88 1.07 0.75 1.50 0.38 40 1.5 0.86 0.60 1.20 0.30
In a parallel ac circuit is the current additive?
Yes
In parallel circuit , current entering into the circuit will be divided intodifferent paths ( resistances) . Amount of current flow depends upon the magnitude of resistance applied in the circuit. Total current after passing through the circuit will be the sum of all current through each resistance.
What is ac resistance of a diode?
ratio of ac voltage applied across the diode to the ac current flowing through it
Actual internal resistance of 1.5 volt battery?
The value of internal resistance of 1.5 volt battery is 0.5 ohms.
