What would you like to do?

# Some places have 120 Volts and others 240 Volts What is the advantage of one over the other?

# What consumes more power 120 Volts or 240 Volts?

Neither of these voltages "consumes more power" because a Voltage does not "consume" anything! .
The voltage supplied by a source of power (like a battery or a generator) …has to be multiplied by the current drawn from that source to give the power (measured in Watts) consumed by an appliance..
An amount of voltage in electricity is often described as being similar to the height of a column of water above the ground in hydraulics. It may help if you think of a water reservoir up in the hills containing billions of gallons of water:.
The "potential difference" of a reservoir's supply of water power is measured by the height of the water, measured in feet or meters , that the water comes out at above its return level. The return level is often the average sea level..
Similarly:.
The "potential difference" of a source of electricity is the height of electrical potential, measured in Volts that exists between the supply wire coming from the source of electricity and its return wire. .
For Direct Current (DC) the supply wire is usually called the Positive or "+" wire and the return wire is called the Negative or "-" wire. .
For Alternating Current (AC) the supply wire is often called either the "Hot" or the "Live" wire and the return wire is called the "Neutral" wire. .
It is also interesting to mention that Negative and Neutral wires are often - but not always - connected to Earth using a separate "Ground" or "Earth" wire. .
http://www.answers.com/main/images/hook-topL.gif%29 "> http://www.answers.com/main/images/hook-topL.gif%29 ; width: 67px; height: 24px; margin-left: 25px; position: relative; top: 10px"> Read more >> Options >> http://www.answers.com?initiator=FFANS .

# Does 120 volts harm 240 volts appliances?

Answer for USA, Canada and countries running a 60 Hz power supply service. .
YOU SHOULD NOT BE THINKING OF DOING THIS! .
It may not harm them but they won't work! For… more information, please see the Related Questions below . .
If the 240 volt appliance uses a lot of power, like a clothes dryer, kitchen range, etc. , the answer has to be No. Apart from International voltage issues, there are good technical reasons why some things made for the US, Canada, or other countries using similar mains supplies, are designed to run on 220 to 240 Volts instead of 110 to 120 volts. The main reason is how much current is needed to get the required amount of power into such appliances that have to use a lot, like clothes dryers, kitchen ranges, etc., because if you double the Voltage you only need to supply half the Current (Amps) to produce the same amount of Power. (Watts or kiloWatts.) If you tried to use something that was designed for 240 Volts on only 120 Volts, the result is not that you would get half the power output: you would get only a quarter! That is because of Ohms Law, which says: .
Amps = Volts divided by Resistance (Ohms) .
and the Power Law which says: .
Power (Watts) = Volts multiplied by Amps .
so it is also true to say: .
Power = Volts x ( Volts / Ohms ) or V 2 /Ohms .
If the appliance was designed to run on 240 Volts, with a certain number of Ohms of resistance, its Power is given by the formula as: .
Power = 240 x 240 / Ohms = 57600 / Ohms. .
So, if the Resistance of the appliance is 5 Ohms its power consumption is 57600 / 5 .
= 11,520 Watts = 11.52 KiloWatts .
If we tried to use that same appliance on 120 Volts, which is half of 240 volts: .
The appliance's resistance would stay the same so the resulting power taken at 120 volts is: .
= 120 x 120 / Ohms = 14400 / 5 = 2880 Watts.
Another way to see it is: if V = 240 volts, and if you are plugging into only half of V: .
Power = (V/2) 2 / Ohms = (V 2 /4) / Ohms .
but as the appliance's resistance would still be the same, the resulting power .
= 1/4 x (240 x 240 / Ohms) = 1/4 x 57600 / 5 = 2880 Watts. .
Anyway, however you calculate it, 2880 Watts at 120 volts is only a quarter of the power which would be supplied at 240 Volts, 11520 Watts. .
The story does not end here, however!.
If you want to supply 11,520 Watts of power at only 120 volts, the current required would be 11520 / 120 = 96 Amps. To allow such a current to be carried safely to the appliance without catching on fire would require extremely thick wiring to be used from the main breaker panel to the appliance. Also, it would not be possible to use any standard 120 Volt breakers, plugs and socket outlets to carry such a current. So no appliances for normal domestic home use are manufactured to operate at such high power outputs on 120 Volts. However, to supply a power of 11,520 Watts at 240 volts, the current required would be 11520 / 240 = 48 Amps. This is well within the normal specifications for the standard wiring sizes and outlets used for 240 Volts supplies, to allow such a current to be carried safely to the appliance without catching on fire. That is why high-powered appliances, such as clothes dryers and kitchen ranges, for normal domestic home use, are manufactured to operate at 240 Volts. For more information please click on the Related Questions listed below..
As always, if you are in doubt about what to do, the best advice anyone should give you is to call a licensed electrician to advise what work is needed. .
Before you do any work yourself, on electrical circuits, equipment or appliances, always use a test meter to ensure the circuit is, in fact, de-energized. IF YOU ARE NOT ALREADY SURE YOU CAN DO THIS JOB SAFELY AND COMPETENTLY REFER THIS WORK TO QUALIFIED PROFESSIONALS.

# How do you convert 240 volts to 120 volts?

If you are asking about socket outlets the best advice anyone should give you is to install a new 120 volt branch circuit using a proper sizes of circuit breaker, wiring and s…ocket outlet. If it is for use by a kitchen appliance, the correct type of GFCI-protected 120 volt socket outlet must be used in a kitchen area. If the voltage you want to convert is alternating current (ac) you could use a transformer of the right size and power rating to supply whatever current is required by the item which needs to be supplied with 120 volts without overheating or catching on fire. If it is direct current (dc) you can drop the voltage using a resistor wired in series with the item which needs to be supplied with 120 volts. The resistor must be of the sufficient size and power rating to carry whatever current is required by the series circuit without overheating or catching on fire. Whether for ac or dc, any power conversion devices must always be properly housed in an electrically safe enclosure to ensure that there is no risk of electrocution to anyone using the conversion device or the item it supplies. The enclosure must also be sufficiently well-designed to conduct away any heat which may be generated by the conversion device so that neither it, nor anything near to it, can be set on fire. As always, if you are in doubt about what to do, the best advice anyone should give you is to call a licensed electrician to advise what work is needed. Before you do any work yourself, on electrical circuits, equipment or appliances, always use a test meter to ensure the circuit is, in fact, de-energized. IF YOU ARE NOT ALREADY SURE YOU CAN DO THIS JOB SAFELY AND COMPETENTLY REFER THIS WORK TO QUALIFIED PROFESSIONALS.

# How do you convert 120 Volts to 240 Volts?

If it is Alternating Current (AC) you can use a transformer of the right size and power rating to supply whatever current is required by the item which needs to be supplied wi…th 240 Volts without overheating or catching on fire. If it is Direct Current (DC) you would have to use a special electronic inverter unit to convert 120 Volts DC to 240 Volts DC. Because no common appliances or equipment require that kind of conversion such inverter units are not generally available as consumer items and would have to be specially designed and assembled to do the job. Note: Electronic inverters to convert 12 Volts DC to 220 - 240 Volts AC are available for use in cars, caravans and similar vehicles. Whether for AC or DC, any power conversion devices must always be properly housed in an electrically safe enclosure to ensure that there is no risk of electrocution to anyone using the conversion device or the item it supplies. The enclosure must also be sufficiently well designed to conduct away any heat which may be generated by the conversion device so that neither it, nor anything near to it, can be set on fire. .
IF YOU ARE NOT ALREADY SURE YOU CAN DO THIS JOB SAFELY AND COMPETENTLY REFER THIS WORK TO QUALIFIED PROFESSIONALS. If you do this work yourself, always turn off the power at the breaker box/fuse panel BEFORE you attempt to do any work AND always use a meter or voltage indicator to insure the circuit is, in fact, de-energized.

# Which is cheaper 120 volts or 240?

The cost is the same ... most houses have both and they use the same meter. BUT most 240 volt devices use a lot more power, which you will pay for.

# Why do some appliances operate on 120 volts and others on 240 volts in a residential electrical system?

Answer for USA, Canada and countries running a 60 Hz supply service. .
When a load is applied from either 120 volt conductor to the neutral (as is the case for typical recept…acles, lights, and so forth) it is using 120 volts. .
However, when a load is applied from one 120 volt conductor to the other, without using the neutral, the voltage being used is the sum of both 120 volt conductors (240 volts). This is the case for many water heaters, air conditioners, electric furnaces, clothes dryers, and so forth. .
For more information see the answers to the Related Questions shown below. .
.
As always, if you are in doubt about what to do, the best advice anyone should give you is to call a licensed electrician to advise what work is needed. Before you do any work yourself, on electrical circuits, equipment or appliances, always use a test meter to ensure the circuit is, in fact, de-energized. IF YOU ARE NOT ALREADY SURE YOU CAN DO THIS JOB SAFELY AND COMPETENTLY REFER THIS WORK TO QUALIFIED PROFESSIONALS.

# What is the advantage of a heater that operates off of 240 volts as opposed to 120 volts?

For the same power consumption, the 240V unit draws only half the current (Amps) compared to the 120V unit. Smaller current flowing in the line cord (as well as the house wiri…ng) means less loss in the wiring before the power ever reaches the heater. This is the main reason that commercial utility power is shipped around at high voltages, and stepped down just before it's delivered to the customer ... that way, the power company loses less of it before it can be sold.

# What is meant by 120 over 240 volts?

Most homes have a 240 volt supply that is center-tapped at the distribution transformer. The center tap is neutral and is also grounded. Each leg is hot..
The voltage from ne…utral to either leg is 120 volts. The voltage between legs is 240 volts. Each leg, measured to neutral, is 180 degrees out of phase with respect to each other..
This is still considered single-phase power. Sometimes, the term split-phase is used. Do not call it two phase, or partial three phase, because the phase angle is 180 degrees instead of 120 degrees..
The advantage of 120 / 240 power is that you can connect normal loads (such as lights) from neutral to hot, and run them on 120 volts, while connecting larger loads (such as clothes dryers and ranges) from hot to hot, and run them on 240 volts..
In an ideal configuration, the current on one leg is balanced to the current on the other leg. This results in zero or near zero current on neutral, and allows the distribution transformer to operate more efficiently.

# Are there adapters for 120 volts to 240 volts?

No. There are no "adaptors". To get 240V from a 120v supply you use a 120-240V step up transformer..
Clothes dryers, water heaters and and other high-power 240 volt appli…ances cannot be run on a transformer from a 120 volt circuit. They must be powered from a separate branch circuit that has the right size breakers, cable and socket outlet to suit the appliance.

# Can you convert a 120 volt Yamaha clavinova to 240 volts?

Electronic technician will convert in no time. You need 240v power transformer in place of same wattage 120V. Super easy.

# Is there any way to split a 30-amp 240-volt circuit so that one branch of it is 30-amp 120-volt and the other branch remains 30-amp 240-volt?

No. This is due to the configuration of the distribution panel. Every breaker to neutral bar is 120 volts. To obtain 240 volts the breaker has to span two of these adjacent br…eaker spaces. To accomplish what you want will take three spaces. One for the 30 amp 120 volt and two spaces for the 30 amp 240 volt circuit.

# Is Canadian power 240 volts or 120 volts?

Both. There are three conductors supplying a Canadian residence, two line ('hot') conductors and a neutral conductor. The potential difference between the two line conductors …is 240 V, while the potential difference between either line conductor and the neutral conductor is 120 V. Most circuits (receptacles, lighting, etc.) are supplied at 120 V, but 'heavy power' items such as electric stoves, etc., are supplied at 240 V.

Answered

# Can a 240 volt appliance run on 120 volt power?

No. Let's say at 240 Volts you appliance draws 2 Amps. This means the resistance of the appliance is 120 Ohms. If you plug it into a 120 Volt source you still have the same re…sistance and by Ohm's Law Current = 120 V / 120 Ohms or 1 Amp. The 1 Amp likely won't be sufficient to allow the appliance to perform properly.

Answered

# How do you run a 240 volt heater with a 120 volt outlet?

220 volt heater on 110 volts The load is a resistive load and as such it is governed by Ohm's law. Current is directly proportional to the voltage and inversely proportiona…l to the resistance. As the voltage goes down so does the current. 2200 watt heater at 220 volts = 10 amps. R = E/I = 220/10 = 22 ohms of resistance in the heater. Now take the 2200 watt heater and using the same formula and at 110 volts. I = E/R, Amps = Volts / Resistance. 110/22 = 5 amps. As you can see ohm's law holds true, the current is inversely proportional to the resistance and as the voltage goes down so does the current. To answer the question, yes a 220 volt heater will run on a 110 volt circuit but at a reduced wattage. W = A x V = 5 x 110 = 550 watts instead of 2200 watts at 220 volts.

Answered

# How does the 240 volts coming into the house become 120 volts?

The 240 volts coming in is coming from two separate 120 volt lines (phases). In your home, it's called single phase, although it really should be called two phase or double ph…ase. In the box, there are two "hot" wires coming in, and one "neutral" wire. You add a ground wire to that yourself (check local codes). Basically (this is very simple description), one of the hot wires gives 120 volts, and the other gives 120 volts, but just a little bit behind the first phase. If you pull the cover off your electric panel, you would see two "hot" wires connected to two separate 'bus bars'. Every other slot on the left side of the breaker box is connected to hot 1, and the alternate slots are connected to hot 2. When you need 240 volts, the breaker you install will take up two slots, adding the 120 (hot 1) plus 120 (hot 2) to give you 240. For your regular plugs, a single slot breaker will deliver 120 volts. If you have a 240 volt plug, it will normally have 4 prongs. Two of the prongs have 120volts each (relative to ground) and 240 volts relative to each other (due to the lagging/leading phase difference.)

Answered

# What state is the switch when you have 0 volts on one side and 120 volts on the other?

The switch is in the OFF position.

Answered

# Can you change a dryer from 120 volts to 240 volts It came wired as 120 volts but we do have an outlet for 240 volts Was hoping to speed up dry times and save some?

If the dryer is a clothes dryer then the short answer no. If it is a hair dryer then there might be a voltage switch on the handle that allows you to change voltages. If the m…anufacturer of the clothes dryer specified that it can be operated on dual voltages then it is just a matter of changing a few terminal connections. Check the instruction manual to see what it states there. This is very unlikely though. In North America all clothes dryers need 120/240 volts to operate. The 120 volts is used for the timer relays and for the drum motor, the 240 volts for the heating elements in the dryer. By changing to a higher voltage, it will not speed up the speed up the drying time. It is more likely that if you plug the dryer into the 240 volt receptacle it will burn the 120 volt motor out.