AC / DC Electrical Power Transmission Line Loss Calculator

The loss of electrical power in transmission lines, also known as line loss, is a significant issue in both Alternating Current (AC) and Direct Current (DC) power transmission. It involves the interplay of various factors such as the power or current driven on the line, wire length, voltage level, and wire gauge. This topic falls under the fields of Electromagnetism and Electrical Engineering.

AC / DC Electrical Power Transmission Line Loss Calculator
AC / DC Electrical Power Transmission Line Loss Calculator Results
Transmission Line Loss = dB

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Example Formula

Transmission line loss can be calculated using the following formula:

Loss = I2 × R


  1. Loss is the power lost in the transmission line.
  2. I is the current flowing through the line.
  3. R is the resistance of the line, which can be calculated based on the wire's length, cross-sectional area (related to wire gauge), and material resistivity.

Who wrote/refined the formula

The formula is a direct application of Ohm's law, which was named after the German physicist Georg Simon Ohm. He first formulated the law, which states that the current through a conductor between two points is directly proportional to the voltage across the two points, in the early 19th century.

Real Life Application

Understanding transmission line loss is crucial for power engineers who design and manage power grids. It helps them choose the right parameters, like voltage level and wire gauge, to minimize power loss and ensure efficient power transmission. For example, this is why high-voltage transmission lines are used for long-distance power transmission - to minimize line loss.

Key individuals in the discipline

Georg Simon Ohm made significant contributions to the field of electromagnetism by establishing Ohm's law. His work set the foundation for electrical engineering and has been instrumental in advancing our understanding of electrical circuits and power transmission.

Interesting Facts

  1. The study of transmission line loss and the development of methods to minimize it have been fundamental in enabling long-distance power transmission, allowing for the widespread availability of electricity.
  2. Ohm's law and the concept of transmission line loss have applications not just in power grids but also in electronics, electric vehicles, and essentially any technology involving electrical power transmission.
  3. Despite the age of Ohm's Law, it continues to be a fundamental principle that guides the design of modern electrical systems.


Understanding the loss in AC/DC electrical power transmission lines and the associated calculations is crucial in the field of Electromagnetism and Electrical Engineering. With these concepts, we can improve the efficiency of power transmission, leading to more reliable and sustainable electricity supply systems.

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