In general, no don't try it. The result will either be damage (e.g. overloaded motor burnout) to the appliance or a severe reduction (e.g. an electric heater giving off only 1/4th its rated heat) in its performance.
It depends on what the appliance is. Some smaller appliances have a dual voltage switch which allows you to adjust the appliance to the supply voltage. Look on the manufacture's nameplate label to see what they recommend as a working voltage. There it will also tell you whether the appliance can be used on another voltage source.
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Yes, you can. But it will fail ("burn out") almost immediately. If it's one that accepts either input voltage or if it has a little '120/240' switch on it, and you flip the little switch to the '240' position, then you're no longer talking about a "120v appliance".
You can if the appliance load is a resistive load such as an electric heater and as such, the heater is governed by Ohm's law. Current is directly proportional to the voltage and inversely proportional to the resistance. As the voltage goes down so does the current.
For example take a 2400 watt heater at 240 volts = 10 amps. R = E/I = 240/10 = 24 ohms of resistance in the heater. Now take the 2400 watt heater and using the same formula and at 1210 volts. I = E/R, Amps = Volts / Resistance. 120/24 = 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 240 volt resistive load will operate on a 120 volt circuit but at 1/4 of the wattage that the resistive load (heater) is rated at. W = A x V = 5 x 120 = 600 watts. 600/2400 = .25 or 25%. It is for this reason why no motor loads will operate at one half their rated voltage.
In some situations 240 volts is classified as single phase. So the answer to your question, the way it is stated is, yes.
Some equipment is designed for variable voltage, but a true 240V appliance should not be plugged into a 120V circuit; you will likely damage it by doing so.
No
Yes, because you will be able to maintain current flow between phases.
Yes the minimum voltage of an 115vac 400 Hz 3 phase motor will run. You can run a single phase motor on a three service but you cannot be run on a single phase.
Houses generally run on single phase power. It would not make sense to convert single phase to three phase to run a house. Please restate the question.
if you wound 3-phase on primary of transformer and secondary side we have to only one cable only such a way that it works as a step down transformer.AnswerYou cannot run a three-phase machine directly from a single-phase (which is what I assume you mean) supply. It won't start. The voltage difference is irrelevant.
The difference between a single phase and a three phase motor is the amount of power conductors that feed the device. As to the other part of the question a three phase motor will not start or run on single phase. The phase angles on three phase are 120 degrees apart on a single phase system they are 180 degrees apart.
Like all supply cables, it all depends on the CSA of the cable
Yes, because you will be able to maintain current flow between phases.
No. The 1-phase 240 setting on your computer's power supply is for the 240V wall outlets in other countries. The 240 outlets in your home are 2-phase 240.
Yes the minimum voltage of an 115vac 400 Hz 3 phase motor will run. You can run a single phase motor on a three service but you cannot be run on a single phase.
Houses generally run on single phase power. It would not make sense to convert single phase to three phase to run a house. Please restate the question.
No. That would be a single phase motor.
if you wound 3-phase on primary of transformer and secondary side we have to only one cable only such a way that it works as a step down transformer.AnswerYou cannot run a three-phase machine directly from a single-phase (which is what I assume you mean) supply. It won't start. The voltage difference is irrelevant.
You can divide a three phase service into (3) single phase circuits providing you have a 4th neutral wire.
The difference between a single phase and a three phase motor is the amount of power conductors that feed the device. As to the other part of the question a three phase motor will not start or run on single phase. The phase angles on three phase are 120 degrees apart on a single phase system they are 180 degrees apart.
If the elevator has a single-phase motor, the diesel generator can also be single phase provided the voltage and VA ratings are compatible.
Yes, if the motor is rated 240 volts 3 phase.There is such a thing as 240 volt 3 phase power.However if you are asking if you can use 240 volts single phase on a three phase motor, then the answer is no.
If the air conditioner is designed for three phase, then it will not run, and could be damaged, by single phase power. Otherwise, no.