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Author Topic: Windmill power cable  (Read 1703 times)

Offline Acebird

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Re: Windmill power cable
« Reply #20 on: February 10, 2018, 10:06:23 pm »
Resistance is not a big thing when the voltage is high.  I wonder how much power is carried by copper vs. steel.
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Offline minz

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Re: Windmill power cable
« Reply #21 on: February 11, 2018, 09:58:33 pm »
AC and DC both have their advantages and disadvantages. Both require a complete circuit to get back to where it originated.  Both are affected the same by resistance (part of the power that is turned to heat). Impedance is difficult to explain, it just changes the relationship between the current and the voltage, and it does no work, just sets up a magnetic field or electrical field (capacitor).
Voltage is not affected by resistance. If you had 100 miles of small wire and put 100 volts DC on it, you would have 100 volts on the other side.  If you tried to move current (to do something useful with it the voltage) the voltage would drop according to ohms law of I*R.
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Offline sawdstmakr

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Re: Windmill power cable
« Reply #22 on: February 11, 2018, 11:22:24 pm »
The reason AC works so well to provide power for long distances is that it is easy to transform AC from a low voltage to a high voltage, transmit it long distances over rather small wire and then transform it back to what is considered safe handling levels.
The higher the voltage the lower the current reguired to do the same amount of work. One amp at 110 volts is only 110 watts. One amp at one million volts is one million watts.
Jim