Description : It there anything other than old age that makes one more appreciative of getting warm sock, nice gloves, or an umbrella for Christmas over gadgets?
Last Answer : I think it’s due to being old. As a child, I didn’t care for practical gifts the way you didn’t. As an adult, I do now.
Description : Apple has brought many innovative gadgets to the end user. Is there something you have been waiting for Apple to do that they have not done yet?
Last Answer : answer:A true convergence between computer and TV as well as the rest of your media (photos, music, etc.) In other words, what Apple TV could be. An actually usable version of ... Apples strength is creating products which don't require a degree in Computer Science or Engineering to operate.
Description : Is the electronic product affected by a leaky (on the side) battery that has been taped over?
Last Answer : answer:If I discovered a leaking battery anywhere, it would go straight into the trash. Batteries cost so little why take unnecessary chances with one that leaks. Makes no sense to me at all.
Description : What can I do to get rid of the tangles in my electronic cords?
Last Answer : Cable ties.
Description : How much would you pay for a used electronic that would normally sell for $200?
Last Answer : $50 to $75 if they are under three years old.
Description : Why is the electronic circuit called "buck" converter?
Last Answer : answer:http://en.wikipedia.org/wiki/Bucking Basically… the converter uses the Inductor to “buck” the voltage up. That is… when the switch is opened, the inductor “bucks”, increasing the voltage.
Description : Who would I approach to create an electronic device?
Last Answer : Try your local university’s engineering department. You may be able to make some contacts there.
Description : What are the best electronic switches?
Last Answer : RadioShack – you’ve got questions, we’ve got answers. (that’s one of the lamest slogans I’ve ever heard!)
Description : In 2001, what common electronic device did British engineers use to locate an in-flight American stealth bomber?
Last Answer : http://web.mit.edu/airlines/www/archives/articles/prof-hansman-quoted.pdf Did I read this correctly? Was it cell phone technology? They refer to it as a passive radar system in the link I site above. ... has anything to do with the reason why you can't use your cell phone on a commercial flight?
Description : Mention the uses of superconductors.
Last Answer : a) Superconductors are used in powerful electromagnets. b) High temperature super conductors are used in microwave devices. c) Superconductor magnets are used in Magnetic Resonance Imaging (MRI)
Description : Mention the applications of transistor.
Last Answer : a) Transistor is used in amplifier. b) It is used in oscillator. c) It is used in switching circuits.
Description : Mention the different types of diodes and one use of each.
Last Answer : a) Light Emitting Diode (LED): They are used in lighting, display units of electric and electronic devices. b) Zener diode: It is used in voltage stabilizers. c) Photodiode: It is used in light sensitive semiconductors. d) Laser diode: It is used in fiber optical fibre communications.
Description : Mention the applications of a diode.
Last Answer : a) Diode is used to convert A.C into D.C. b) They are used in voltage regulation systems. c) They are used in logic circuits which are used in computers.
Description : Mention the characteristics of a diode.
Last Answer : a) Diode has a p-type semiconductor at one end and a n-type semiconductor on the other end. b) It can be biased by connecting to an external source of e.m.f c) It may be forward biased or reverse biased. d) It allows current to pass through in one direction only.
Description : Do manufacturers purposely make computers, and other electronic gadgets with a limited life span?
Last Answer : answer:Yes. It's called obsolescence. Products are designed to become out-of-date or to have a limited lifespan. I remember as a kid we owned a Hoover vacuum cleaner. That thing went for ... Now, washing machines break down within a few years. Keeps manufacturers in business though doesn't it?
Description : Does anyone know what happened to Golden-Shellback? Supposedly a company developed a technique for waterproofing electronic gadgets, but after a lot of intial hype and media attention, they seem to have disappeared. Where'd they go?
Last Answer : I remember them, but their treatment was really expensive. There were youtube clips of an iphone playing songs under water, even using the screen to navigate to show it wasn't a dummy phone. That's ... and Gorilla Glass. Then I wouldn't be so paranoid about dropping it in a rain puddle : )
Description : Are there any electronic gadgets available that measure moisture and other soil factors in a garden?
Last Answer : Yes there is the HQRP 4-Pin Moisture Analizer Gauge Tester.
Description : Thermocol (expanded polystyrene) is not used for (A) Low temperature thermal insulation as in refrigerator and air conditioners (B) Acoustic control and ceiling for building (C) High temperature thermal insulation in furnaces (D) Packing of delicate electronic gadgets
Last Answer : (C) High temperature thermal insulation in furnaces
Description : What is the most important feature of a superconductor?
Last Answer : The most important feature of a superconductor is that once current is setup in a superconductor ring, it will continue indefinitely even if the battery connected is switched off.
Description : What is critical temperature?
Last Answer : The temperature below which material becomes superconductor is called critical temperature.
Description : What are superconductors? Give example.
Last Answer : The materials which show property of superconductivity are called superconductors. Example: Mercury, oxide of compound of Lanthanum, Barium and copper.
Description : What is meant by superconductivity?
Last Answer : The property by which certain materials show almost zero resistance at a very low temperature is called superconductivity. Ex: The resistance of mercury drops abruptly to zero at 4.2K
Description : What is an oscillator?
Last Answer : Oscillator is a device to produce electric oscillations of a desired frequency.
Description : Write the principle of a transistor or amplifier.
Last Answer : A small change in the input signal (voltage) results a large change in the output signal (voltage).
Description : Write about the biasing of a transistor.
Last Answer : Emitter base junction is forward biased while collector base junction is reverse biased.
Description : Name the types of transistor.
Last Answer : a) Bipolar Junction Transistor (BJT) b) Field Effect Transistor (FET) c) Metal Oxide Semiconductor Field Effect Transistor (MOSFET) d) Junction Effect Transistor (JET)
Description : Write the functions of the tree regions of a transistor.
Last Answer : a) Emitter: It is of moderate size and heavily doped. It emits large number of majority carriers for the flow of current through the transistor. b) Base: It is the central region of the ... larger in size compared to emitter. It collects a major portion of majority carriers supplied by the emitter.
Description : What is a transistor? Name its three regions.
Last Answer : Transistor is the short form of transfer resistor. It is a device having three terminal semiconductor. A transistor has two ends regions called emitter and collector. The middle is called base.
Description : Name the types of rectifier.
Last Answer : The two types of rectifier are: a) Half wave rectifier b) Full wave rectifier.
Description : Why is a diode called as rectifier?
Last Answer : Diode allows current to pass only when it is forward biased when AC voltage is applied across a diode. This property is used to rectify AC voltage. Hence a diode is called as rectifier.
Description : What is a rectifier?
Last Answer : A rectifier is a device that allows current to pass through in one direction.
Description : Why is there a small flow current during reverse bias?
Last Answer : In reverse bias there is a small flow of current due to minority charge carries electrons in p region and holes in n region.
Description : Why does a reversed biased diode offer high resistance?
Last Answer : The charge carriers are repelled from the junction and no current flows through the junction. Thus the diode offers a high resistance.
Description : Why does a forward biased diode offer low resistance?
Last Answer : The external voltage over comes the junction potential and provides an easy path for the flow of charges across the junction. Hence it offers low resistance.
Description : When is a p-n junction said to be forward biased or what is meant by forward biasing of p-n junction? How does it affect resistance?
Last Answer : When the positive terminal of a cell is connected to p-side and negative terminal to the n-side of a p-n junction then it is said to be forward biased. It offers low resistance.
Description : What is bias voltage?
Last Answer : The external voltage applied to make p-n junction biased is called bias voltage.
Description : When is a p-n junction said to be biased?
Last Answer : When an external source of e.m.f is connected to a p-n junction, it is said to be biased.
Description : What is meant by depletion region?
Last Answer : The thin region around the junction containing immobile positive and negative charges is called depletion region.
Description : What is meant by junction potential?
Last Answer : The potential difference that is established due to the diffusion of electrons and holes across the boundary in the p-n junction is called junction voltage. The junction potential is 0.7v for Silicon and 0.3v for Germanium.
Description : What is a p-n junction?
Last Answer : The junction that is obtained when a p-type semiconductor and an n-type semiconductor are kept in contact is called p-n junction.
Description : What is a semiconductor diode or junction diode?
Last Answer : A diode is a single crystal of semiconducting material which is doped one side with a donor impurity and the other side with acceptor impurity.
Description : Explain the formation of a p-type semiconductor.
Last Answer : When a small amount of a trivalent impurity like Boron, Indium, Aluminium or Gallium is added to a tetra valant element like Silicon or Germanium, three electrons of each impurity atoms ... and becomes n-type semiconductor. In an ntype semiconductor the majority charge carriers are holes.
Description : Explain the formation of an n-type semiconductor.
Last Answer : When a small amount of a penta valant impurity like antimony, arsenic or phosphorous is added to a tetra valant element like Silicon or Germanium, four out of five electrons of each impurity ... becomes an n-type semiconductor. In an n-type semiconductor the majority charge carriers are electrons.
Description : How are extrinsic semiconductors classified?
Last Answer : Extrinsic semiconductors are classified into two types depending upon the type of impurity added into a) n-type semiconductor b) p-type semiconductors.
Description : What is meant by doping?
Last Answer : The process of adding dopants to enhance the conductivity of semiconductors is called doping.
Description : What are dopants?
Last Answer : A dopant is a substance (impurity) that is added in traces to increase the conductivity of a semiconductor.
Description : What is an extrinsic semiconductor or doped?
Last Answer : A semiconductor whose conductivity is enhanced by addition of minute traces ofimpurities is called doped or extrinsic semiconductor.
Description : What is an intrinsic semiconductor or pure semiconductor?
Last Answer : A semiconductor in which the number of holes and electrons are equal is called intrinsic orpure semiconductor.
Description : Explain the term ‘hole’ in electronics.
Last Answer : When an electron is detached from the co-valent bond, it leaves a vacancy which behaveslike a positive charge. This vacancy is called a hole.
Description : Give reason: a) 14th group electrons are semiconductors except carbon.
Last Answer : a) 14th group electrons are semiconductors except carbon.The valence electrons have a low energy that they cannot become free by absorbingnormal energy from the surroundings. b) Silicon is ... same 4 valence electrons but silicon can be used at highertemperatures, cheaper and abundantly available.