Consumer Electronics

we do get electric shocks as when we hold a peice of electric wire in our hands and when the electricity switched on, the electrons get transferred through us in the free air. if we hold a peice of cutted wire in both our hands (one hand holding one hand and the other holding another end ) and we complete the circuit and switch the electricity on, nothing will happen but at the point where we leave the wire from our hands, we will get n electric shock.

Ignoring all the pioneering work and various inventors of TV, it was in 1936, 2nd November. The BBC at Alexandra palace, transmitted the first regular broadcast, designed to be picked up by the public, using EMI's electronic scanning system.

It was broadcast alternately with Baird's mechanical system, which was more black and orange than black and white.

This first black and white TV broadcast, was on the 405 line system at VHF frequenies.

MIDI is abbreviated for Musical Instrument Digital Interface. The digital standard for connecting computers, musical instruments, and synthesizers. A compression format for encoding music. Abbreviated MIDI. It is written in all capital letters.
Musical Instrument Digital Interface

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The disadvantage is - it's easy to abuse it ! Some companies allow anyone to use their franking machine - meaning that any employee can frank personal mail, thus avoiding paying for the postage. Franking machines are 'loaded' with pre-paid credit. Once the machine is 'primed' - anyone can feed letters through it - and use the credit until it's exhausted. That's why most franking machines are locked away until the end of the working day, and one person franks all the outgoing mail.

Who invented the microwave? Huh?

That's like asking who invented water or sunshine.

Microwaves are radio waves with wavelengths that range from about one meter to as short as one millimeter, with frequencies between from 300 MHz to 300 GHz.

If you're asking who invented the microwave oven, it was Dr Perry Spencer, after accidentally discovering that microwaves can heat food. In 1945 he was an engineer working for Raytheon, working on a radar set that used high power microwaves, and noticed the Mr Goodbar in his pocket started to melt. The first food to be purposely cooked by microwaves was popcorn, and later on an egg, which exploded in the face of someone helping him. He later fed microwaves from a magnetron into into a metal box and saw that it heated food rapidly.

Raytheon filed a patent for the microwave cooking process on October 8, 1945.

If you're talking about battery sizes like AAA, AA, C, D and 9V, Ni-MH (Nickel-Metal Hydride) is the most common one, and as far as I know the only type in these sizes other than the now obsolete Ni-Cd (Nickel-Cadmium). Li-ion (Lithium ion) batteries have also been introduced in these sizes, but they have a significantly higher voltage and thus are not usable on regular battery-powered devices out of the box.

The highest capacities for Ni-MH based batteries are something like this:

AAA 1000 mAh

AA 2900 mAh

C 5000 mAh

D 8000 mAh

There are also newly-developed Ni-MH batteries with low self-discharge (LSD) like Panasonic Infinium and Sanyo Eneloop. These kind of batteries are particularly suitable for low consumption devices like clocks and remote controls, but they're also good for devices drawing high currents such as digital cameras. They apparently used to have a lower capacity than ordinary Ni-MH batteries, but currently the two types are pretty much on par. The LSD batteries can be marketed as "pre-charged" or "ready-to-use".

CD-R's use a sort of fluid in them that reflect light but don't after it is burned. A computer uses a code of 1's and 0's so the laser light from a CD ROM is bounced of by the reflection and is counted as a 1 and when it is not bounced back is a 0, so the laser burns the fluid.

The microwave oven and a new type of magnetron. For more information go to www.invent.org/Hall_Of_Fame/13.html

Germanium has four number of shells while Silicon has three number of shell. therefore for germanium less energy is required to move the electron from valence band to conduction band if compared to silicon.

So at room temperature for germanium their are more number of electrons present in conduction bond hence more number of holes present in the valence energy band. Due to movement of holes reverse saturation current is produced.

Their is more number of hole movement in germanium comparatively therefore reverse saturation current is more than silicon for germanium.

You may refer to Electronic Devices and Circuits by Allen Mottershead

Regards,

Zain Ijaz

UCTI, Malaysia

Mechatronic Engineer.

Facebook is the most popular site.

NO! that is very dangerous. Microwaves go through ceramic.

It depends on the voltage. WH = Watt Henry, mAH = milliamp Henry, watts = amps * volts and milliamps= 1000 * amps. Thus the conversion is:

mAH = 1000 * WH / V,

where V is the voltage.

I'm looking at the battery for my Dell Studio and it's rated 85WH and 11.1V. So it's 1000 * 85 / 11.1 = 7658 mAH, so in this case 85WH is better than 6600 maH.

If we solve 1000 * 85 / V = 6600, we get V = 12.9. When converting from WH, the bigger the voltage the lower the mAH. So for voltages bigger than 12.9 V, 6600mAH is better than 85WH.

Hope this helps.

First, both players have to be in a Pokemon center and have to talk to the trading person at virtually the same time.

You only need one cable, and you connect it to the little port on the side of both of the game boys.

Inventory Turnover Ratio = Cost of Goods Sold / Average Inventory

and

Average Inventory = ( Beginning Inventory + Ending Inventory ) / 2

by using main frame computer where all costumes data are stored as usage and billing will be processed and send out automatically

we have a number of methods, nuclear type technology where a reaction creates heat which is transferred to a gas coolant and then to a water bolier system, which makes steam and this drives a high speed turbine.

..

there are still some coal fired stations operating .

.

there are some small er type gas turbines .

,

and there are some water powered methods .

one example is a large reservoir of water is allowed to drain at short notice,

and the resultant revolution of a turbine blade creates electricity .

later the water is pumped back up to the lake reservoir using cheaper electricity.

..

there are other methods being devised of course .

with the encouragement to find alternative methods, wind driven turbine

blades are used , but some say this is an eyesore on the landscape .

however there are already a large number of these being utilised already

....

other methods on the drawing board are wave powered and tidal - under research.

nuclear power is still a favourable option though because it releases a

much lesser amount of co2 gas to the environment when compared to other methods of production

The magnetron of the microwave is an extremely powerful transmitter of microwaves at the frequency of 2.45GHz. At this frequency fats and water absorb the energy by means of dielectric heating.

The metal inside of the microwave oven will not cause problems since it is earthed and act as a shield, it absorbs any electric field continuously over its relatively large and smooth area. Therefore no charge builds up, because it is earthed. It is so effective as a shield, that it would never leak as much as 10W/m2 at 5cm distance. Most manufacturers would specify leakage at 5mW/m2 as maximum while the magnetron inside produce about 800W of radiative power. Other experiments show that it can reduce a RF signal of 2.4GHz with about 100 times.

It is usually unearthed metal objects with sharp points thats cause arcing. The object act as an antenna and accumulates an electric charge from the electric field that is perpendicular to the magnetic field of the electromagnetic field transmitted by the magnetron. The electric charge tends to be more concentrated at sharp points without any path to discharge. Once the charge is large enough and the distance between this charge and the grounded shielding is short enough. The breakdown potential of air is bridged which acts in the same way as lightning does. Once the charge accumulate to a potential difference that exceeds 3MV per meter between the object and the earthed shielding, then the air becomes a conductor due to the great amount of electrons stored in the field around the conductive object. Then the charge on the metal object will discharge towards the shielding which is the shortest path to the ground. Once the most of the electric charge is transferred to the earth, the charge becomes significantly less and to little to continue the breakdown condition. The air becomes an insulator again and the spark is gone. This will be the case until the charge is generated again to a voltage of 3MV per meter.

This charge and discharge cycle can happen at fast intervals causing a buzzing or arcing sound. The breakdown potential is not only breaking down the air, but it also has to break down through the painted layer in the inside of the shield. It will be the same as with electronic capacitors that blow as the potential passes the breakdown potential, so would the painted layer of the inside of the microwave oven also burn and be seriously damaged. The temperature in the spark can run up to thousands of degrees centigrade.

Another problem can be electric current induced and received in thin foil that will cause heating or even fuse or melt. If a CD or DVD is placed into a microwave oven then the metal coating at the rear side of the disk will most likely melt away not because of the arcing as such, but because of high current flow through the thin metal layer which can even melt the plastic.

Not all metal objects in a microwave would actually spark. Some objects such as grills that are specially designed for microwave ovens often is designed to be large and smooth surfaces or even earthed. They would actually work in a microwave oven without problems. Whether the object will spark or not, has much to do with the shape, sharp points, clearance, earthed or not etc. Often aluminum containers may work well in a microwave as long as its sides are smooth and do not touch the sides, while a fork will spark like crazy due to the high charge that is concentrated at the tips. This however is not easy to assume for all metal objects whether it will spark or not. In some cases aluminum foil can be used in a microwave to shield of some parts of food that do not need as much heating. The normal foil is thick enough not to heat up from the current. But then again, wrinkled foil can be very unsafe because of its unevenness and its pointy texture. Therefore I would not recommend to experiment with metal objects in a microwave oven. Stick to the manufacturers specifications. It can cause serious damage to your microwave if the experiment would fail.

This is also the reason why we shouldn't use cellular phones at gas stations, although the risk is practically very small that the cell phone will cause nearby metal objects to spark and cause the fuel to ignite, it is theoretically possible in some scenarios to happen. However the microwave oven often is about 300 - 3000 times more powerful than a cell phone transmitter section and therefore the effect of a cell phone has on metal objects are significantly less.

A carrier frequency is a single radio frequency with steady amplitude.

Alone, it would sound like silence on a receiver.

This is the frequency that a radio receiver is tuned into.

To be of use in communication, this carrier wave has to be changed in time with another signal (usually audio), called 'Modulation'

It can be turned on and off using a Morse key.

It can be changed by shifting the frequency, FM.

It can be changed by varying the amplitude, AM.

It can be changed by adding or subtracting audio to the carrier. Single Side Band.

It can have data applied by shifting between two carrier frequencies. FSK. (Frequency shift keying.)

It's called a carrier, because it is the carrier of information without necessarily being the information itself.

Transistors provide most of the activities a circuit needs to operate. In their most basic representation, transistors are amplifiers. That is, they take and amplify a signal from the level produced by a microphone and amplify it enough to blast it out through a speaker. Transistors are also used on decision making circuits, like electronic gates and Central Processing Units (CPUs). Solid state, electronic systems like desktop computers, cell phones, and GPS devices would not be possible without transistors.

Cell phones are like miniature walkie-talkies. Only they can transmit and receive at the same time. They don't have much power, so the cable companies have cell phone towers a few miles apart to pick up the signal on the cell phone. When the phone starts getting too far away from the cell tower, the phone starts receiving the next strongest signal from another tower.

I recommend LEDShoppe.

It's a 5 mW laser pointer that can be seen a mile away, with a LED light on it as well. Only $3 with free shipping, and they are buy one, get TWO free!

The only bad thing is that they ship from Hong Kong, so it will take a week or two to get it but it's worth it for 3 bucks.

At 2 a.m. on March 10, 2013, Americans will turn their clocks forward one hour, The federal law that established "daylight time" in the United States does not require any New Federal Law__îSpringing Forward in March, Back in November.