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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 do you know if a capacitor is good or not?
You test it.
For electrolytic capacitors, it's sometimes (but not always) obvious simply by looking at it that there is a problem; if the capacitor bulges or is actually ruptured, that's a pretty good indication that it might be bad. However, the only way to know for certain is to check it to see if it has the proper capacitance.
For various reasons it's difficult to test the capacitance of a capacitor which is in a circuit; you'll usually need to detach it and test it in isolation. It is possible to check the equivalent series resistance of a capacitor without removing it from the circuit, and in some cases this may be enough (a correct ESR doesn't necessarily mean the capacitor is good, but an incorrect one means that it's bad).
What is the advantage of using the centre tapped full wave rectifier?
By using a center tap, with the tap connected to ground you can use one winding for the positive AC swing and the other winding (both relative to the center-tap) for the negative swing. Thus, when the secondary windings can be connected to the AC inputs of a full-wave-bridge rectifier to harvest a bi-polar DC power source.
i.e. - a positive DC voltage 'rail' AND a negative DC voltage rail, say for example you have a 24VAC center tapped secondary of a 110VAC transformer. With a full-wave bridge, the center tap becomes the circuit 'ground' (aka 'return') in a DC circuit.
Difference between de mosfet and e mosfet?
The basic difference is between JFET and enhanced MOSFET,although the construction of JFET and depletion MOSFET is different but their most of the characteridtics are same,i.e shockly equation can be applied on both of them,but in JFET we cant give to gate voltage, the +ve value,because it does not works, but in depletion we can give,but some limited +ve value. Now enhanced MOSFET is different,shockly equation cant be applied.The transfer characteristics are purely in +ve Vg region. i.e for E-MOSFET Vg should be > 0,for its proper function.
answer by engr ZOHAIB MUSHTAQ WHEN EMF APPLY AT TWO DIFFERENT ENDS OF METALLIC PLATE HAVING COMBINE JUNCTION HERE ONE END IS HOT AND OTHER END IS COLD THIS EFFECT IS PELTIER EFFECT
Created around a conductor when electrons flow through that conductor?
Then an 'electrical current' is said to be present in the conductor.
well if the bulbs arerated for 110v then 200w but if the bulbs are rated for 220v then only 100w if the bulbs are rated for other voltages then you nedd to do some more calculations.
The total power consumed = 50W.
Calculation:- P=V^2/R
R1=220^2/100
R1=484Ohms.
R2=484Ohms.
R=968Ohms.
I=V/R
I=220/968
I=0.2272A
P=I^2*R
P=(0.2272)^2*968
P=50W.
What are the advantages and disadvantege of capacitors?
Capacitors are very good for storing small quantities of electrical energy, for creating timing circuits based on the time it takes a capacitor to charge, and there are also excellent uses of their characteristic of conducting a varying voltage.
Both a capacitor and battery "store charge". However, in a battery there is a chemical reaction that continues to generate charge. You apply a charge across the "plates" of a capacitor and it will decay over time from leakage or through a discharge resistance to ground in the circuit. You need really large capacitors to store meaningful amounts of charge, to take the place of a battery for example.
How do you determine correct size varistor on a 24vac coil?
is this coil a single shot solenoid or is it used as a filter i assume you want to know a good value for a varistor to stop voltage spikes from the reverse EMF which is aprox. 4X the input voltage. so i would say to use 2X-3X the input Voltage so 48 or 72 Volt MOV (Metal oxide varistor) You want the varistor to be several volts greater than the peak voltage of the signal across which it is connected. 24 volts is probably the RMS value of the coils voltage. Your varistor must be selected to be greater than the peak voltage. When the voltage exceeds the clamping voltage of the varistor, it conducts current, preventing the voltage from reaching a dangerous level. If the elevated voltage is maintained for too long a time, the varistor will heat to a point where the metals in it melt and fuse together, causing a short. This also poses the posibility of a fire risk, as the current is now conducting heavily through the varistor. This is what often happens to a varistor in a power strip when lightening strikes nearby. It renders the power strip useless. But the connected devices are usually spared.
What means OL in the multimeter?
In a multimeter, "OL" stands for "Over Limit" or "Open Loop." It indicates that the measurement exceeds the range of the multimeter, such as when measuring resistance in an open circuit or when the voltage is too high for the selected range. Essentially, it signifies that the reading is outside the device's capability to measure accurately. If you see "OL," it's advisable to adjust the multimeter settings accordingly.
Do additional resistors affect power?
Of course. Additional resistors change total resistance, which changes current, which affects power.
What are the applications of logic micro operation?
A logic microoperation specify binary operation for a string of bits stored in registers.These operation consider each bit in the registers seperately and treat it as a binary variable.
Eg:-F--A(+)B
If the contents of register A is 1010 and that of register B is 1100 than the information is transfer to register F is 0110
Why does a bulb in a circuit not work?
A light bulb is not lit when the swtich is not connected to the wire becasue there is no flow of electricity, specifically, flow of electrons. By disconnecting the wire, the bulb is no longer connected to the electricity source.
Is there any difference between dc and ac bulb?
Answer Yes you can use a AC rated bulb on DC, When using an AC bulb on 110volt DC you would need to double the wattage of the bulb to get the same amount of light output. So if you need 50 watts of light you would need to use a 100 watt bulb on 110 volt DC. One benfit of using DC is the bulbs last longer! Hope this helps. It is important to understand that 110 volts AC is also referred to as "effective voltage" or "DC equivalent voltage". In reality, the true voltage at the wall outlet is anywhere from 311 to 340 volts peak to peak alternating current in the U.S. at 60 cycles per second. A cycle is a sine wave starting at zero volts at the short slot on the outlet swinging negative to approximately 160 volts negative in respect to neutral or ground then going to approximately 160 volts above ground or neutral 120 times per second. The 110 volts is derived by dividing the peak to peak voltage by two, then multiplying .707 root mean square, which equals the term 110 to 120 volts alternating current.
Answer
The original answer is incorrect. An incandescent lamp will work on a.c. or d.c. and will provide exactly the same power at the same voltage. This is because 110 V d.c. provides exactly the same heating effect as 110 V a.c.
7805 ic is a voltage regulator,up to 5 Volts can maintain.
How to calculate heat produced in the resistance?
It takes approximately 4.184 Joules of heat to raise the temperature of 1 gram of water 1 degree C. 1 Joule is the energy of 1 Watt for 1 second (or 3,600,000 Joules equals 1 Kilowatt-hour). In more real world numbers: It takes 69.7 watts 1 minute to heat a liter of water 1 degree C; or 146.6 watts in 1 minute to heat a gallon of water 1 degree F. A watt is a watt, weather it comes from resistance, radiant or induction. The only variations will come from the efficientcy of the heat source's design and how it is being used.
How can a broken wire affect a series circuit differently than a parallel circuit?
In a series circuit, all the current passes through the one circuit. Any break will totally remove power from all of the circuit.
Parallel circuits have more than one branch where the current can flow. A broken wire will only affect one part, the rest of the circuit will still pass current.
In a series circuit, all the current passes through the one circuit. Any break will totally remove power from all of the circuit.
Parallel circuits have more than one branch where the current can flow. A broken wire will only affect one part, the rest of the circuit will still pass current.
How do you increase the frequency of Alternating Current?
There are two ways. If you want to increase the frequency by a huge amount and you want to do it on a permanent basis, install more magnets. An alternator that has one pair of field magnets and that turns at 3600rpm will generate 60-hertz electricity. If you put two pair of field magnets in it and turn it 3600rpm, it will generate 120-hertz electricity, and so on and so forth. (The other side of that is, if you want a certain frequency of electricity, the more pairs of magnets you install the slower the alternator has to turn. Install four pair of magnets in the generator, and you only need to run the engine at 900rpm--which makes it much quieter, a big advantage if the generator belongs to the army.) If you just need to adjust it a little, simply rev up the engine. If you have a generator that makes 60hz power at 3600rpm, accelerating the generator to 3660rpm will cause it to make 61hz electricity.
When a voltmeter is connected to a resistor what will it read?
If you place an OHM meter across a resistor, it will read resistance.
An OHM meter set to read voltage will read any voltage present.
So, if you pick up a resistor, connect it to a volt meter, in theory, no voltage will be present. Unless you're feeding some sort of electricity through it.
I'm certainly not an electrical engineer, I do however use a volt/ohm meter occasionally. A volt/ohm meter is a dual/multi purpose piece of equipment.
Diff between electrical and electronics?
Where as "Electronics" relates more to the complex functions performed within a given device, more often now days by circuits comprised of many micro electronic sub components that make up the structure of a single micro electronic component. Example: a typical CPU chip would / could contain thousands of individual transistor circuits within a device no bigger that the size of your small finger nail with room to spare.
In short: electrical circuits handle transfer of energy - electronic circuits handle transfer of information
what is the main difference between electrical and electronics ?
In short: electrical circuits handle transfer of energy - electronic circuits handle transfer of information
How are wind turbines transported?
Energy can not be created or destroyed but only changed from one form to another. Wind energy is changed to mechanical energy of the turbines. The turbines can then generate electricity.
What is a analog-to-digital converter chip?
Its an IC which converts the analog signal at its input into digital output suitable for digital applications. It is an essential part of any digital system
What properties are desirable in semiconductors?
A piece of intrinsic (pure) silicon at room temperature has, at any instant, a number of conduction-band (free) electrons bthat are unattached to any atom and are essentially drifting randomly throughout the material. Also, and equal number of holes are created in the valence band when these electrons jump into the conductance band.
