Why do we have 110V, 115V, 120V, 208V, 220V, 230V, 240V, and so on? Can 208-230 run on a 240 supply safely?
368541
Probably yes.\n\nFor general purposes, any voltage from 110V-130V can be considered the same thing.  Same for any voltage from 208V-240V.  The variations are due to many factors including distance from the outlet to the nearest transformer, capacity of the circuit, other attached devices, etc.\n\nMost devices today are capable of handling the seemingly wide variance in voltages. (e.g. a device rated for 220V can handle any voltage from 208V-240V.)
744720
Of course.  But before doing that check the currents that are required for the load.  Usually, appliances running at 12 VAC are also low power, and those that run at 230 VAC are high power.
2627
I could suggest several considerations.  First P=IE, that is Power equals the electrical current (I in Amperes) times the voltage (E in volts).  Current is like the flow of water in a pipe and voltage is like the pressure causing the water to flow.  If you use the water to drive a hydraulic piston (say to hoist an automobile for repair) you can use either a small piston and high pressure or a larger piston and lower pressure.  Which is more cost effective?\n\nIn the United States, electric power is delivered to neighborhoods using three wires (three phases) strung along telephone (power) poles.  Only two of the wires are led to a single residence but the neighborhood must use all three wires to balance load on the wires.  Within a house electricity passes from only one wire (phase) to ground or earth to light a lightbulb which uses 110 volts.  The clothes dryer that needs far more power is connected between two of the supply wires (two phase) and to ground to supply 220 volts.  A machine shop might connect a very large motor to all three supply wires to obtain even more power at 440 volts.\n\nSix volts or even 12 volts DC in an automobile circuit can be touched with little danger.  It is less dangerous to accidentally touch a 110 volt AC wire than a 220 volt source and 440 volts is most dangerous.\n\nTherefore, the selection of voltage depends in part on safety and then on the size of the job to be tackled and also economic factors.  The higher the required current, the larger the required wires using expensive copper.  Increasing the voltage reduces the needed current and reduces the needed copper to do a given job.  The higher the required voltage, the more expensive the required electrical insulation will be.  Engineers must determine the best trade off of many factors.
924875
50,000V\n\nOtherwise, if you use Kilo, you just use the K - eg: 50 KV
756481
Normally this is a "Restive" not voltage question/answer, and the proper neutral to ground = 2 Megg ohms (min.) this being incorporated in a residential application.\nHigher voltage in let us say a 3-phase utilization this # is on the low side. (assuming a.c. source. d.c. is a completely different animal!
659041
as an electrician I am not surprised that none of the above know what they are talking  about.  220v uses EXACTLY half of the watt hours as 110v). This why Europe uses 220v as normal house current. (Fridge, toasters, lamps, etc, etc)  There is not a 110 outlet in Europe.  When the power company generates electricity, they pull energy from different parts of a wave.  110 only taps a wave once. 220 taps the same wave twice.  What isn't tapped is wasted.  The cost of adding a 220 outlet wherever you want it will be recompensed very quickly.  You will pay for your air conditioner and then some within three years.  Believe me.
966091
probably the fact that it is made for the usa market and the power rateing is 0nly 120volt not 240 like ours,so if u get it and plug into the mains u will burn it out so u have wasted ur money,try european markets but stress u need for uk
74897
No, that's exactly what happens at your house.  There's 220VAC coming in from the utility to your main circuit breaker, L1 & L2.  You can then run L1 or L2 in conjunction with Neutral referenced back to the main ground and there’s your 110VAC.
644717
Rearranging the equation watts=volts*amps to solve for amps gives:\namps=watts/volts\nFor example, 1,200 watt hair dryer on the regular household voltage of 120V uses 10 amps.\nBe aware that your A/C may run on 220V or 240V, so check the data plate before calculating.\n\nAlso be aware that inductive devices like the electric motors in your A/C may have a power factor other than 1, but I would ignore that if I were you, because I find it confusing. If you don't want to ignore power factor, here are a couple of links.
820597
It all depends on what you are operating and why. 230 volt runs slower making it more energy efficient. That is why, as an example, pool equipment runs on 230, as opposed to 110. It needs to run for longer periods of time, stays cooler to last longer, thus saving you more money! But the energy companies you get your electricity from don't want you to know that. They would lose money. That is why pool pumps can run either way, fast and more sucking power or slower and more energy efficient. But, the washing machine and refrigerator are both 110 volt, the most expensive appliances to run in a household. They both run for long periods of trime. You do the math and say what is better.
341482
Ok break it down:\n1) A power supply converts AC power (110 in the states) to some other required voltage. For this (lab) project I'd presume a DC regulated voltage from, say 1.5 to 15V something like that.\n\n2) Digital and programmable means you'd control the output voltage with some sort of digital signal like up/down buttons, a keypad, or a PC hookup.\n\n3) You are supposed to use an 8051 to accomplish this.\n\nSo there are several ways to do this. One way would be to have the 8051 accept a command to set the voltage and produce a PWM signal. Let's say the PWM signal is a 5V output switched from 0 to 100%. You can use an RC filter to produce 0V to 5V from this signal. If your instructor is nice, you could argue that this meets the criteria -- especially if you use it to drive a pass transistor to develop some serious current (but your voltage is now 0V to 4.3V because of the BE drop).\n\nBut I'd instead use an op amp with gain X3 (plus a little extra) so that I got from 0 to 15.7V and then use the pass transistor. Another idea would be to use the voltage to drive a simple current source which would program a LM317 voltage regulator.\n\nWeb searches on things like LM317, PWM, and "pass transistor" are your friends here.
888989
230v is measured between phase and neutral therefore L1 (R) N, L2 (Y) N and L3 (B) N.\n\nNote a star connection is Y. In your house you use 230v-240v single phase, i.e phase and neutral. Phase to phase 240√3 = 415v.
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
970916
110V 60hz\nhttp://en.wikipedia.org/wiki/List_of_countries_with_mains_power_plugs%2C_voltages_and_frequencies
173271
In the motor and VFD variable frequency drive industry, the standard speak is Amps, which is replacing HP old school.\n\nYou must realize that in an industry in which the typical 3phase power is based on 480VAC.\n\nThis means when someone is sizing a motor for a specific application they speak of the Amps need to perform the task.\n\nThe drives (VFD) which I work on are typically between 10amp up to 3000amp. Usually, 480Vac, sometimes 600Vac or 690Vac.\nA drive which is rated at 690Vac, 705amp is 600Vac, 800amp for the same drive.\n\nYou need to know both, HP and Amp for the machines which you are interested in. That means what is the typical voltage for the area. USA vs Canada vs UK vs Asia They are all different. \n\nKeep in mind Amps are Amps regardless where you are. Heavy wire sizing is crucial.
738167
Unless you are playing with low voltage, please find some other project. 120 Volt or 220 volt is very dangerous.\n\nAny way you will need all the components in same voltage I say get every thing in under 9 volts to make things easy, they must operate in 6 to 8 volt range so you will have voltage to spare. You may not be able to find them readily.\n\nThis is how it works.\n\nClapping sound is picked up by micro phone.\n\nThis produces a signal, that will close an open circuit on a lamp(or any thing that you need to turn on like a bell).\n\nTo make a package, like the one you buy in the store, it took quite a few years to perfect it, and they had experts working on it.. \n\n1.  9 volt battery. few to operate the systems.\n2.  red and black wire.\n3.  9 volt lamp.\n4.   6 volt Micro phone.\n5.   Sound activated switch, 6 volt \n6.   Tapes electrical.\n7.    cardboard to mount every thing.\n8.    cutting tool to make connections.\n9.    Solder iron and silver solder wire.\n10.   Different types of connectors.\n11.   Glue to put components on the board. \n\nEdmund-scientific.com may have a kit, it is on Internet.\n\nBuy the kit and assemble it.
847868
Are you talking about Distribution transformers ? Then that 3-phase transf. becomes free floating, which means the 'nutral' line receives ALL the phases WITHOUT nutralising them to the Earth reference potential (Standard 0 volts) and hence all the SINGLE PHASE equipment connected to power will experience the 3-phase voltage (up to 440 volts) rather than single phase (about 230 volts). You know what it will do. In case of single phase transformers, and looking at most common load-connection configurations, not much will happen. But you may find more interference on the electronic equipment connected to it.