High-Voltage Power Transmission Projects Are Booming Around the World [Yahoo! Finance]
SIEMENS AG SPONS ADR (SIEGY)
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Source: Yahoo! Finance
The majority of major electric power transmission lines in the U.S. are 115-kV, 230-kV, or 500-kV alternating-current (AC) lines. These high-voltage lines are crucial for efficiently transmitting large amounts of electricity over long distances. The primary reason for using high voltages is to minimize power losses during transmission. In accordance with the equation P = V x I, where P is power (watts), V is voltage (volts), and I is current (amps), higher voltages allow lower currents for the same amount of power transmitted. This is important because all conductors, including transmission lines, have some inherent resistance (R, ohms) that impedes the flow of electric current. This resistance causes a voltage drop along the line and dissipates power in the form of heat. Because V = I x R, the power equation can be rewritten P = I x R. This shows that the power loss is proportional to the square of the current flowing through the conductor. Therefore, because higher voltages allow l
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