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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 can you tell if your polaroid mp3 player is charging?
You can tell when it is charging when the bars pop up on the screen and it starts to save all your information the bars will star blinking by threes. When it's done all the bars will be filled yellow.
Which h value of capacitor is more effective as a filter element the larger or smaller and why?
100 microfarad
What is considered the best conductor silver aluminum glass or silicon?
Silver has a resistance of 1.59x10(-8). Copper has a resistance of 1.72 x 10(-8) Gold has a resistance of 2.44 x 10(-8) Aluminum has a resistance of 2.82 x 10(-8). So the best is Silver then Copper, then Gold, and last Aluminum. (5/07/09)
Is a light bulb an inductive load or resistive load?
Most simple incandescent light bulbs are made of a thin section of tungsten through which the current flows.
This section of tungsten is called a "filament".
The tungsten filament has electrical resistance and so is a resistor.
As a resistor it develops a voltage drop. This voltage drop multiplied by the amperage passing through it equals the wattage of the bulb.
The heated tungsten gets to thousands of degrees above room temperature and becomes hot enough to produce yellow-white visible light.
As a resistor, the tungsten light bulb has a positive resistance coefficient.
This means that the electrical resistance goes up when the filament becomes hot.
For example, a 100 watt light bulb operated at 120 volts - it does not matter if it is AC or DC for this calculation - will have a resistance of 144 ohms when hot and draw .833 ampere.
When cold the filament typically has a resistance of only 10 ohms which increases as the filament heats up.
What is magnetic deflection focusing?
A scheme for focusing sheet, beams by means of a periodic configuration of magnetic fields directed transverse to the beam is presented. Discussion of a particular model gives information about stability limits and perveance. This scheme, which lends itself to the incorporation of intense magnetic fields, should be immune to the space-charge instabilities of beams focused in longitudinal magnetic fields. The focusing mechanism is such as to produce coupling between the beam and electromagnetic waves of phase velocity exceeding the velocity of light. Application to millimetre-wave tubes is anticipated.
Why diode 0a79 is used in amplitude demodulation?
This is very old germanium diode and nomenclature comes before a standard had been established for semiconductors. They modeled 0A after the vaccum tubes where 0 - zero means 0Volts filament voltage and A meant single diode.
Latter , semiconductor nomenclature come where the first number was telling a number of PN junctions followed by N (this is for US), Japanese and Europeans had different naming standards
Why would it be more comfortable to walk on hot beach with flip-flops than without them?
Because the flip-flops will act as insulators and protect your feet from the hot sand.
How much energy is lost in converting DC to AC energy?
how much energy is lost in converting dc energy to ac energy
Is it easier to do a front flip or side flip?
a back flip
or a front flip wich is sooooooo much easier.
Where does the current come from that moves the needle on an analog clamp on meter?
A: Directly from whatever you are measuring as a Small current to move the coil to indicate current flow. That current can be calibrated to read voltage or current on the meter itself
How do you generate double-sideband suppressed carrier?
it can be genrated by multipling of the carrie signal and the message signal that varies the amplitud of the carrire nd supprssd the caarir signal.
What will happen to phase angle if the the value of capacitor is increase?
in a series RC circuit phase angle is directly proportional to the capacitance
How does an electrical power cable affect a coaxial signal cable?
There isn't or shouldn't be any power in coaxial cable. It is just for the TV or computer hook up. Just so you can receive the signal from the broadcaster or Internet.
In several ways the previous answer is wrong.
Firstly coaxial cable is exactly like normal 2 wire cable (fig8 cable) except that instead of two separate wires running side by side separated by insulation) one wire is inside the other (again separated by insulation). There are many different types of coax (probably hundreds eg one i use is rg-58 which is for two way radios, another is rg-6 which is used for tv coax)
secondly- if any signal is to be passed through a cable- there has to be power flowing through it- it may be incredibly small (microvolts like from your tv antenna) or very large (hundreds of volts like in a high powered radio transmitter)
Even in a tv coax, if you have a `masthead amplifier' that only has 1 cable running up to the antenna and a funny box behind the tv that has 2 coax leads running into it and a plug-pack from a PowerPoint going into it as well- you would find that you are actually passing power up the coax from the PowerPoint plug-pack to the electronics up on top of the tv mast - power going up and tv signal coming down the same coax at the same time- saves on another two wires having to be run!!!
Many `cable' tv or internet cables have a similar `power over coax' arrangement for powering amplifiers on long cable runs, this is normally stopped by a filter before the end users outlet however (if the filter is faulty this can be the `tingle or zap' that you sometimes get when touching the outer screw connector of the coax plug)
Where can one purchase a screen divider?
Typically these items can be found online, but to save money on high shipping costs the buyer should check out local crafting stores, stores that deal in exotic or ethnic furniture, and stores like Ikea and the pottery barn, find the one that fits your budget and you needs.
How do you calculate the ir1 and ir2 in a parallel circuit?
To calculate the currents ir1 and ir2 in a parallel circuit of two resistors r1 and r2, consider the voltage across them. By Kirchoff's voltage law, the voltage across each resistor will be the same, so simply use Ohm's law to divide voltage by each resistor to get each resistor's current.
ir1 = v / r1
ir2 = v / r2
If you don't know voltage, but you do know total current, then determine the total resistance as RT = R1R2/(R1+R2), calculate voltage as ITRT and proceed from there.
What is a rule for current flowing round a circuit?
In a series circuit, the current at every point in the circuit is the same. This is a consequence of Kirchoff's Current Law, which states that the signed sum of the currents entering a node must equal zero. Since a series circuit consists of nodes with only two elements connected to each node, it follows that the current at every point in a series circuit is the same.
What is the relationship of the input frequency and output frequency in a FULL-wave rectifier?
The frequency of a full-wave rectifier is double that of the input, if the input is a sine wave or triangle wave.
If the input is a square wave, the output is DC.
If the input is a sawtooth wave, the output is a triangle wave of the same frequency.
What are safety precautions of Ohms law?
no idea at all....
Otherwise you'd have known it by now !!!
Sorry.
A "smart material" is one having a molecular structure that responds in a particular and controlled way to influences upon it. These range from magnetically-changed materials, to "memory" molecules that return to their original form, to materials that generate an electric charge when pressed, twisted, or warped.
These materials can significantly change their mechanical properties (such as shape, stiffness, and viscosity), or their thermal, optical, or electromagnetic properties, in a predictable or controllable manner.
Some types of smart materials are piezoelectrics, electrostrictors, magnetostrictors, and shape-memory alloys.
Would the generation of static electricity consume power?
It takes energy to create static electricity, so in that sense, there is power applied to make it. Static electricity is generated by friction. Even the movement of air over the land creates friction enough to move static charges. Force has to be applied to generate the charge differential. You walk across a rug and get zapped on a doorknob. A tiny amount of the energy you expended walking was used to separate the charges that got you lit up. It seems we are always seeking a way to get something for nothing in the world of power generation. It ain't happening here. It takes power to create power, even in the world of static electricity.
What is the difference between a transistor being use as a switch and as an amplifier?
When used as a switch, a transistor is usually driven completely on (saturation) or completely off (cutoff). There are a few kinds of switching circuits though (e.g. ECL) that avoid saturation/cutoff to obtain faster speed, these operate on a fixed constant current and switch it through one of two transistors.
When used as an amplifier it is biased so that it operates in a linear, or near-linear, part of its characteristic curve so that the output faithfully copies the input.
