Some places have 120 Volts and others 240 Volts What is the advantage of one over the other?
The answer given below refers only to USA, Canada and other countries using the same type of 60 Hz, 240 Volts "balanced around ground" system for standard mains power supplies to homes, offices, etc. Basically, it comes down to reducing the amount of lost power due to resistance of the wires in the walls of your home. Higher voltages can deliver more power to a load, with less power lost in the transfer. The downside is that higher voltages are more dangerous, and require more insulation to keep the wires safe to touch.
The long explanation
The reason behind why it can transfer more power, is a bit complicated. It all comes down to Joule's laws. Power used (P) is equal to Voltage (V) times Current (I). (P=I*V) So twice the voltage will transfer twice the power. So why not just use double the current, and avoid the safety issues with higher voltages?
Wires conduct electricity, but they also have some resistance. The more the resistance, the more power is lost due to heat. The power loss in wires can be calculated by using the equation P(loss)=I^2*R (or current times current times resistance). We'll ignore resistance for now, and assume it's constant. If you double the amount of current going through a wire, you quadruple the power losses and heat generated by 4 (2 * 2 = 4). So by using twice the current, you have transferred twice the power, but are now losing 4 times more power in the wires. The amount lost is small, but not trivial.
So let's say we want to cut our power losses by a factor of 4, while still transmitting the same amount of power. Remember the equations P(loss)=I^2*R and P(used)=I*V.
We can double V and halve the I and still get the same amount of power:
1/2*I * 2*V = I*V = P(used)
This will cut our power losses by 4:
1/2*I * 1/2*I * R = 1/4*P(loss)
Or, we could cut the resistance by 4 and leave I and V alone:
I*I * 1/4*R = 1/4*P(loss)
To do this though, we would need to increase the size of our wires which can get expensive, and is much more difficult to install.
There are other much more complicated reasons as well, dealing with mutual inductance and power factor correction, but they can be ignored as they're way outside the scope of this answer.
No, "do not try to be fool others" does not make sense. It isn't clear if you mean to use "fool" as a verb or a noun. You may mean one of these: Do not try to fool others. - (Do not try to trick or confuse other people. "Fool" is a verb in this sentence.) Do not be a fool for others. - (Do not act foolish and allow other people to take advantage…
This is just a standard that has been applied differently in different locals. much the same as cars originally were 6 volts but now the standard is12 volts. There is no intrinsic advantage other than maintaining the standard makes it easier to move electric motors from one area to another. The same vacuum cleaner works in NewYork and Denver. India has set their standard at 220 volts and this standard is maintained throughout the country.
it hurts less when you get electricuted? Other than that, not much - just depends on what you're trying to run off of that power supply. 110 volts grid requires bigger number of smaller size of step-down transformers. Smaller transformers can be placed on a poles. 220 volt transformers are significantly bigger and heavier so they cannot reside on poles and need to be setup on the ground or inside of a building. This is…
The basis of European explorations were to find new undeveloped places where they could establish colonies and take advantage of the natural resources that were found in these underdeveloped places. They also made explorations to chart and map out new areas on the earth. This would be of general benefit to them, but also allow them to have a military advantage over other nations that did not accurate information to help their logistics or their…
Yes, I was personally electrocuted at work by a transformer that had 480 volts. I have experienced memory loss for 2 years now. I also have some other conditions including depression, sleep deprivation, irritability's and others. I was wondering if any body has reported on memory loss due to electrocution and how severe it is.
Does a 12 Volt center-tapped transformer yield 12 volts from the tap to each end or 12 volts between the ends?
If you mean that the VCT (volts center-tapped) equals 12V, then the answer is that there are 12 volts from the center tap to each end, resulting in a total of 24V. However, these two sides will be 180 degrees out of phase, meaning that when one is positive the other is negative and vice versa. Because of this you can easily split this into a 12v DC source which has +12 volts on one…