In Figure 6.18. The Thevenin's voltage viewed from terminals a and b can be determined: www R4 w R₁ RL bo R2 +21 E2 W 1+ R3. W Figure 6.18 by replacing Rд with an open circuit and measuring the voltage across these terminals by replacing Rд with a short circuit and measuring the voltage across these terminals by replacing Rд with a short circuit and measuring the voltage across R4 by replacing Rд with Rh and measuring the voltage across these terminals

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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.