why are voltage rating's usually a multiple of 110(i.e.,220v,440v.etc)?
149476
This is my best guess based on a familiarity with the issue, but please don't take this as definitive.  I just wanted to give some answer as noone had as of yet.  \n\nAs I understand it, Edison used a voltage of 110 in his original DC systems after finding experimentally that it was the highest voltage that would illuminate his carbon filament bulbs enough to beat gaslight without burning them out too quickly.  Exactly what was considered "too quickly" I don't know.  \n\nThe first AC systems adopted the 110 V standard, although Nicolai Tesla, who developed such systems for George Westinghouse, wanted to use a higher voltage, 240 V.  \n\nLater, when some electrical systems switched to a higher voltage, they went with a multiple of 110 so as to make it easier to tap into one phase of the voltage to get the old 110 V potential back.  This is essentially what we have in the US.  We have 220 V service to our homes, and a few of the appliances that consume a lot of power, such as clothes dryers and AC systems, are wired to that, but the rest of the outlets are wired for 110.
261277
It's simple do this job. First of all you need to set your volt meter to a specific voltage level. Like if you want to check voltage of batteries, it ranges between 1.5 to 14 volts. So set your volt meter dail to DC (Direct Current) with this voltage specification.\nFor checking voltage in your house, its a 110-120 V or 220-240 V. This depends on your location. So now you have to set the dail to AC (Alternating current. THe symbol of AC is " ~ ".\n\nI', also a site here. It would solve the job definitly.\n\n\nhttp://www.ehow.com/how_16767_voltmeter.html
648766
The other 2 answers are basically right, but Kes has no clue.\n\n3 phase voltages are normally specified by the phase to phase voltage (say 480V).  If a neutral is present from a wye transformer, the phase to neutral may be specified second, such as 480Y/277.  But just saying 480Y means 480 phase to phase in the wye configuration.  The phase to neutral voltage is the phase to phase voltage divided by the square root of 3 (about 1.73).\n\n480V 3 phase is not something to play with.  If you don't know what you are doing, you shouldn't even be in a position to be able to measure the voltage.\n\nTo Kes, normal home wiring is single phase 240/120.  2 phase is a system that existed before 3 phase became standard.  For what you call "440 V" for motors, it would be 440 V between phases.
26408
The standard in Canada is 120v at 60Hz.\n\nHere is a table that lists many countries and their standard voltages:\n\nhttp://kropla.com/electric2.htm
257792
When it says that it's 120VAC, it means that it's designed to run on power from the wall.  It's not designed for a low voltage (12V) situation.  The amperage measures at what current it might start malfunctioning.  Since a relay is a sort of switch, it's not a question of that much power being dissipated in the device.  (If it was generating 1200 W, it would be as hot as a toaster).
430412
The wires are placed on the poles according to their voltage - highest voltage on top (farthest away from people) and lowest on the bottom. This means the bottom one(s) is usually telephone (12 volts), then cable tv (30 volts) then the "secondaries" which are what your house runs on (220 volts) and then all the way up top, the "primaries" which carry electricity over long distances, and are usually 13,600 volts.
1074739
what is your question?\n\nA 220 Volt Circuit works the same as any other voltage.  Voltage pushes electrons and work is done.
135636
because we are generatiing power in 11 kv.  then, we can easily transform this 11kv to 22kv,33kv,66kv,110kv or 132 kv. the reason for this easier transformation is, number of tunrs in secondary can be easily adjusted. for example if we need to transform 11kv to 66 kv, we need 6 times more number of turns in secondary. but if you want to transfer 11 kv to 44 kv,you need 4.4 times more turs in secondary. this 4.4 turns is not possible.that is why these types of voltage is using for electricity transmission
424895
It seperates wear the wattage is going between the two seperate rails... It is like a house wired for 240.  Some of your outlets go to one rail in the electrical panel on 120 some to the other rail of 120.  Then yet others use both rails for 240.  In the computer power supply they never really combine both rails though, just split where the end of the line goes.
780345
yeah thats off the hook, people at my skool were talking abotu this\n\nthats a 110 out of 110
488998
it should not exceed 5 mSev :) ..
927371
Voltage is analogous to the PRESSURE forcing water through a pipe, and electric current is analogous to the liquid FLOWRATE.  220 volts is twice the "electrical pressure" of 110 volts, so it would force twice as much electrical current (amperes) through an appliance as 110 volts would.\n\nAs other answerers have noted, the appliance plugs are usually designed so that you cannot do this by accident.
171789
Many CRT's can do that. Take a look at these here:\n\nhttp://www.newegg.com/Product/ProductList.asp?Submit=ENE&N=2000190019+70002970+70000422&Subcategory=19&description=&srchInDesc=&minPrice=&maxPrice=&ATTR1=&ATTR2=&ATTR3=&ATTR4=&ATTR5=&ATTR6=2000190019+70002970&ATTR7=&ATTR8=2000190019+70000422&ATTR9=&ATTR10=
158215
220\n        /   &#92;\n       2    110\n           /   &#92;\n          2    55\n              /  &#92;\n             5    11\n\nI believe this is how you do it. Hope this helps. \n- www.memeluke.tk
310
Practical: As there are multiple very-incompatible voltages in use (110v, 220v), it's a good idea to not have the same plugs. Somebody will inevitably plug in the wrong device, and putting a 110v device on 220v can be pretty nasty. Dual voltage devices which are popular today (largely due to power semiconductors which make them inexpensive), didn't exist when plugs were designed!\n\nPolitical: Many ex-colonies of Britain were trying to shake off British influence as far as possible, which probably was a factor in picking different system for power device standards, among others.
1079800
in one case you have half an ohm, in the other you have over 500 ohms.  It seems you may be reading one of the meters incorrectly.  One of the meters could be set to auto, while the other is not.
302920
If you have a 220v line going into your house, sure.  Otherwise.. no.  Most homes have 110/120 lines going into them.