Compute the power for each of the given voltage current combinations and state for each case if the element is absorbing or supplying energy. 1. Is the element labeled active or passive? Why? 2. V₁ = -5V and I₁ = 7A (a) Calculate the power (b) Is the physical characteristic of the element active or passive? Why? (c) Is the element absorbing or supplying energy? Why? 3. V₁ = -3mV and I₁ = -2.5mA (a) Calculate the power (b) Is the physical characteristic of the element active or passive? Why? (c) Is the element absorbing or supplying energy? Why?

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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.