4.9. Compute the rectangular form of the four-point DFT of the following signals, all of which are zerc for a <0 and nz 4: (a) 지이 -1, 피1 -0, 피2)-1, 피지 -0 b) 이 -1. 피%30. 피리3-1, 지33D fe) 피이=1, 피1] =D1,지2=-1, 지3 1 %3D

Q: The second column is E,F,G,H.

A:

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A: The relation between electric intensity E, voltage applied V and the distance d between the plates…

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Q: 72000

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A: By krichoff's current law we will write node equation and we will find out node voltage .

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A: For this figure I1, I2, I3 , and I4 can be calculated as:

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HVDC

HVDC stands for high voltage direct current in the electric power transmission system. The high voltage direct current system uses direct current (DC) for the transmission of electrical power through transmission lines in contrast with the alternating current that is the AC system. The HVDC is used to transmit bulk power point-to-point through long distances transmission lines. Power is rapidly transferred because the efficiency of transmission lines is greatly increased over long distances due to HVDC lines.