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music_lover12
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how do you minimize resistance on a power line if there is a large amount voltage and low amperage being sent through it to a house and the house ends up with a lot of power? :uhh:
This sentence can be misunderstood. The amperage in the line is constant, and voltage drops because of ohmic losses.russ_watters said:Resistance kills amperage, not voltage, so you raise the voltage to minimize the power loss. Resistance is just a physical a property of the wire.
music_lover12 said:how do you minimize resistance on a power line if there is a large amount voltage and low amperage being sent through it to a house and the house ends up with a lot of power? :uhh:
lpfr said:This is the reason why no power lines work at millions of volts. They would be too expensive and a nuisance.
DeepQ said:There is a million volt line that runs from Utah to Southern California.
Xezlec said:Yeah, I thought there were quite a few lines at or above a million volts, both AC and DC. Wikipedia appears to list at least a couple of each.
lpfr said:Would you please give references?
I searched Google, but the only thing I found is a 1.15 MV power line in Russia.
I would also know what you do with 1MV DC. As you cannot use transformers to lower the voltage, you need something like a motor-generator that works at 1MV. I'm not electrical engineer and I am very curious to know how such a thing works.
Thanks Xezlec. I found the answer about inverters in the entry linked in WP. I learned that it was possible (in the time past) to build inverters with thyratrons. You are right, no need of motor-generators. I knew that DC lines where built long time before solid state power devices where available.Xezlec said:You definitely don't need a motor/generator. Solid state is regarded as preferable. You just use a http://en.wikipedia.org/wiki/Valve_hall" or something (a building full of giant transistors or other switching devices) to invert the signal 60 times a second.
If you read again my post, you will realize that I said that it is not cost effective to build power lines of millions volts. I did knew that 400 kV where usual and that there where some at 600 kV. Maybe, the Russian one was justified by its length, but it is not sure that at the time it was built, the cost was an issue.Xezlec said:As for DC, the above-linked Wikipedia page on HVDC lists several lines (in the tables near the bottom) greater than or equal to +-500kV, which is a megavolt all the way across.
lpfr said:If you read again my post, you will realize that I said that it is not cost effective to build power lines of millions volts.
High voltage refers to an electrical potential difference that is significantly greater than the average voltage in a given system or environment. It is typically measured in volts (V) and can range from a few hundred volts to millions of volts.
Low amperage, also known as low current, refers to the flow of electrical current in a circuit or system. It is measured in amperes (A) and is typically considered low when it is less than 10A. Low amperage is often associated with high resistance, which can limit the amount of current that can flow through a circuit.
In order to generate a large amount of power, it is necessary to have a high voltage and low amperage. This is because power is calculated by multiplying voltage by amperage, so a high voltage and low amperage can result in a large amount of power output. This is commonly seen in high voltage power lines that transmit electricity over long distances.
Working with high voltage and low amperage can be extremely dangerous if proper precautions are not taken. High voltage can cause severe electrical shocks, while low amperage can still be lethal if it passes through vital organs. It is important to always follow safety protocols and use appropriate protective gear when working with high voltage and low amperage.
High voltage, low amperage, and large power are commonly used in a variety of practical applications, such as power transmission, electric motors, and welding. They are also used in medical devices, such as X-ray machines and defibrillators. Additionally, high voltage and low amperage are utilized in electronic devices, such as televisions and computers, to power and regulate their circuits.