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20 Volts - (the original answer). Nice math but not enough information.

My answer - 220, 230 and 240 volts are really all the same, just as 110, 115 and 120 are also. 240 volts single phase is what comes into most houses, into your power panel, using two "hot" wires and a neutral. Simply stated, each hot wire powers one side of the panel and delivers 120 "nominal" volts to each side and breakers are installed to provide 15 amp or 20 amp etc circuits to most household outlets and lights. When a breaker covers both sides of the panel, it can supply 240 volts at 30 amp or 40 amp or 50 amp etc. for things like dryers, ovens, water heaters, etc.

Each "nominal" 120 volt line can actually vary from about 112 volts to 128 volts, and you can't complain to the power company. For whatever reasons, devices and appliances will call for a 110 or 115 or 120 volt power source, but must be prepared to run at anything between 112 and 128.

Devices that run at 240 volts use both of the 120 volt lines to provide the increase in wattage required by the device (wattage = volts times amps).

208 Volts 3 phase (usually commercial) is different than 240 single phase (usually residential), but that's for another question.

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13y ago
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13y ago

10 volts. Kinda simple really.

In a residence the primary VAC is in range from 110-120 Volts AC (VAC). The two hundred range therefore typically runs from 220 Volts to 240 Volts. Devices made to run in this range typically operate from the lower to the higher voltage range.

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11y ago

The frequency of 50 Hz is the governed by the rotational speed of the generator. The voltages of 220 and 240 volts are a nominal figure in the same voltage range. It is brought about by the power company, as they have a responsibility to keep voltages within a certain 10% range. The load will only notice a difference of 1% on the load current. e.g. Wattage load of 2400. Amps = watts/volts. 2400/240V = 10 amps. 2400/220V = 10.9 amps. On a constant resistance as the voltage goes lower, the current goes higher and vice versa as the voltage goes higher, the current goes lower.

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9y ago

The difference between a 120 volt and a 240 volt is one has more power. Volts are the power that comes from a battery.

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14y ago

its the safety factor

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Q: What is difference between a 220 volt outlet and a 240 volt outlet?
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