what is the usage of diode in daily life?
145102
1.  To convert low-voltage a.c. to d.c. as occurs in all electronic appliances, e.g. c.d. players, electronic keyboards, stereos, etc.\n2.  As indicators, and appears as coloured lights on electronic appliances,e.g. the graphic equalizer that has a set of lights that moves up and down according to the signal, bass, mid-range, treble, etc, fed to it. Also, when you turn on the stereo and you see a red or green light near to the power switch, that is a light-emitting diode (LED)\n3. Within the last year, a new use is that an array of white LEDs are used to replace the wire-wound bulbs in battery-operated flashlights (torchlights).  Less heat is produced, a brighter light is obtained,  and the batteries last as much as 30 times longer.  This is good news for the ecologists!!
478814
Both are similar devices in that they only conduct current in one direction and if you apply a voltage in the non-conducting direction and gradually increase it, for a high enough voltage it will suddenly start to conduct.   But zener diodes are designed to break down at an accurately-known voltage, specified by the manufacturer, so they're designed to be used as voltage regulators.   You can buy them in a wide range of breakdown voltage.   A rectifier diode is designed simply to convert AC to DC.
11978
It's not the best solution, but a piece of iron pyrite or germanium will make a diode.  Its the same materials that you can use as the crystal in a crystal radio.  There's no telling exactly where you'll have to connect the wires to make it work properly, so you'll have to do some experimenting with it.  I've also heard of rust making a good diode for a crystal radio.
866935
http://en.wikipedia.org/wiki/Transistor\n\nIt's a big subject, at that is just a start.
517083
True, you're not going to wirelessly power much of anything nowadays, but not because it's impossible.  RFID uses wireless power, but it doesn't need much of it.  The EM waves needed to wirelessly power something significant like a cell phone require much more energy than is worth expending when you can just charge it from your power outlet.  You can buy cell phones and chargers now where you only have to set your cell phone on a base and it will recharge it without a wire, but recharging it from that base while you're walking around probably will never happen.  It would probably mess a lot of nearby electronics up, require much more energy than required to charge the phone, and possibly be dangerous to your health (insofar that living underneath transmission lines may be dangerous to your health).
547583
Water + Electricity = Bad News\n\nSealing electronics and connectors is difficult and expensive.
95109
This might help\n\nhttp://www.ttec.co.tt/consumertips/conserveelectricity/default.htm
1066501
As others have said, much more electricity is used if you leave it on all day.  However, if you're going to be using it at various times during the day, by all means leave it on - saves time and wear and tear on its parts.
269316
There are many types but all work on the principle that different semiconductors (i.e conducts electricity under certain conditions) placed together can turn on larger currents in another circuit.\nThe metals usually used are Germanium, Gallium, Asenide or compound of these including Silicon and Aluminium.\nYou might want to look at http://en.wikipedia.org/wiki/Transistor for more detailed info.
530906
I found this on a website that actually sells appliances that run on the power available in the phone line\n\n"The Phone Company always has a steady source of DC power available. Huge banks of storage batteries backed up by generators, supplying from 23 to 80ma of power on every phone line... for you to use whenever you want! \nTelco Powered Products™ convert the 48 Volts DC from the modular jacks in your home or office to a voltage that can be used to power the items you need to get on with your life, even if there's no power from the electric company"
931090
AC in and DC out.\n\nA diode only allows current to flow in one direction and blocks it if it is wrong.\n\nthe diodes in the bridge are connected together so that the +V current flows in One direction. the bridge .....( I cant be bothered)\n\nwikipedia has the answer...\n\nhttp://en.wikipedia.org/wiki/Bridge_rectifier
543419
Electricity most certainly CAN be stored! Inside of nearly every electronic device ever manufactured, you'll find a component known as a "capacitor".  Large capacity, polarized "electrolytic" capacitors store energy for anywhere from just a few tenths of a second, to as long as several hours, depending upon the "load", or in other words, just how much "drain" is imposed. It's equivalent to filling a large bowl with water, and then either "dumping" the entire bowl of water out, or, conversely, slowly letting the water drip out, in a small stream.\n  If, for example, you charge up a 2200 microfarad capacitor from a 12 volt DC power supply, and then you turn off the power, disconnect the capacitor, and then hook the capacitor to an "LED" (light-emitting diode) and limit the "current flow" with say, a 1K (1000 ohm) resistor wired in series with the LED, the slow discharge will cause the LED to light up, and stay illuminated for several seconds, as the capacitor slowly discharges electrical energy into the LED.\n  Also note that nickel-cadmium and nickel-metal-hydride batteries store electrical energy, and can run small appliances such as cell phones and video cameras, for many hours!\n  The lead-acid battery in your car is continually charged by your car's alternator, (actually a generator) in order to allow you to start your car, each time you put the key into the ignition.\n  DC-to-AC power inverters that are now sold everywhere, can turn the 12 volts DC from your car battery, into 120 volts AC, which is what comes out of your wall outlets, in your home.\n  The various means used to store electricity for home use can be expensive and complex, but they are even now, in use by many people, in many parts of the world.
812693
amplifiers are a common use of transistors. Basically any circuit where you want to control a large voltage or amperage with a small voltage is done with a transistor. They are a fundamental building block in modern electronics as well.
563199
Most diode are connected so that when they are forward biased current goes the direction that you want it to. There are also Zener diode which are designed to be run reverse biased. They are used to provide a constant voltage.
243322
http://www.edn.com/index.asp?text=noise+and+diode&content=all&original=noise+diode&layout=searchResults
882064
I don't think it would work. A diode works on principles of quantum physics that require the internal junction to be manufactures according to certain specifications. Putting a copper conductor on between the junctions would destroy all the effects that make it a diode; that is assuming you managed to cut it exactly at the junction. \nBy the way what where you planning to do with such an idea?
938575
Depends what you mean by electronic device. Only some circuits give of electromagnetic radiation - e.g. cell phones, unshielded power supplies.\n\nThe sorts of electromagnetic radiation given off by consumer electronics is safe. The only exception is cell phones. The latest advice is to avoid using a cell phone regularly for excessive periods without a headset - especially children.\n\nNo devices give off nuclear radiation (except smoke detectors)