How much resistance R1 must be added in series with a 400 Ω R2 to limit the current to 0.25 A with 120 V applied? Which statement is correct about a parallel circuit? a)The source voltage is equivalent to the voltage across each load. b)The total current is equivalent to the sum of the branch currents c)The total resistance is equivalent to the sum of the reciprocal of each load resistance. d)The source voltage is equivalent to the sum of the individual voltage drops.

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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.