# What is the difference between 110V AC and 220V AC

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#### thaer11

##### عضو
You asked what the difference is between 110 and 220 volts but I think what you really want to know is why a home is typically supplied with two difference voltages. How much power (work) you can get from an outlet is limited by two things. How much current the wires can carry before they start to over heat and how much voltage is supplied to the outlet. A bigger wire would allow more power, but copper wire is expensive, so instead, when you need more power (work) than a standard outlet can handle, engineers opted to supply the home with a higher voltage. This allows you to get twice the amount of power out of the same size wires without the extra cost of larger wires. Warren answered very well how the power company does this.

#### thaer11

##### عضو
The are very few electrical appliances that draw so much current to need a 220 volt circuit. They are the drier, the oven, the hot water heater and the furnace.
This is true in the US, but other countries developed different standards. In most of Europe, a standard outlet is 220 ac.
If you have followed all this, you might think "So why not just make all outlets 220 volts?". Well one reason is how potentially dangerous a circuit can be is determined by how much voltage is present. You are more likely to be seriously hurt by accidentally getting shocked by a 220 volt circuit than a 110. I've be shocked by both many times and can tell you that 220 hurts a lot more, but this depends a lot on where you get shocked at. There are other reasons why different countries use different voltages and has been answered well here: Why is electricity in the USA 110v when the rest of world uses 230v?

#### thaer11

##### عضو
110 V system is costlier compared to other for both consumer and the utility. Let's take an example. You have an electric pump that draws 5 amps to lift the water to overhead tank at 220 V. Provided that the pump is designed for both the power systems, it would draw double the amps on 110 V system compared 220V system to do the same work (P=V*I, if power factor is taken as unity). You know that more the amps, thicker the cables and heavier the switch gears. Same applies to the utility transformers, switch gears and cables. Secondly, there is more loss of power (R*I^2) in distribution line in 110V system as double the current (I) is required to do the same work . Both of these factors add up the cost considerably in 110V system
On the other hand, 220V system is quite hazardous than 110V system. You would probably feel a more terrible shock, if u happen to touch a 220V system. It might require higher level of insulation, but that does not add cost much.