NLC Electrical Grid 1 (EG-1) Practice Exam - Prep & Study Guide

Using high voltage in transmission systems primarily allows for more power to be transmitted with reduced losses. This principle is rooted in the physics of electricity and the relationship between voltage, current, and resistance.

When electrical power is transmitted over long distances, the resistive losses in the transmission lines become significant. These losses are proportional to the square of the current (I²R losses), meaning that as current increases, losses increase rapidly. By increasing the voltage at which power is transmitted, the system can operate at a lower current for the same amount of power. For example, if the transmission voltage is raised, the current can be decreased proportionately to maintain the same power level. This reduction in current directly minimizes resistive losses in the transmission lines, making high voltage transmission an efficient method for long-distance power distribution.

The advantages of high voltage also lead to improvements in the overall efficiency of the electrical grid, as well as less energy wasted as heat in the transmission lines, ultimately contributing to a more reliable power supply. This efficiency in reducing losses is a critical consideration for utilities managing large-scale electrical transmission networks.