# What are the 4 parameters of a Transmission Line?

**URL:** <https://forumautomation.com/t/what-are-the-4-parameters-of-a-transmission-line/14000>\
**Category:** Electrical\
**Tags:** line\
**Created:** [April 9, 2026, 4:01am UTC](https://forumautomation.com/t/what-are-the-4-parameters-of-a-transmission-line/14000 "2026-04-09T04:01:08Z")\
**Posts on this page:** 1\
**Page:** 1

<div class="post-metadata">

**Author:** ![Rabert](https://forumautomation.com/user_avatar/forumautomation.com/rabert/32/6784_2.png) [@Rabert](https://forumautomation.com/u/Rabert)\
**Post date:** [April 9, 2026, 4:01am UTC](https://forumautomation.com/t/what-are-the-4-parameters-of-a-transmission-line/14000/1 "2026-04-09T04:01:08Z")

</div>

Electric power lines do not behave like simple wires.

They have four important properties that affect how electricity flows.

## Resistance (R)

**[Resistance (R)](https://forumelectrical.com/winding-resistance-test-of-transformer/)** is like friction in the wire. It slows down current and converts some energy into heat causing power loss.

## Inductance (L)

When current flows, a magnetic field forms around the wire. This stores energy and resists sudden changes in current.

## Capacitance (C)

The two conductors act like a **[capacitor.](https://forumelectrical.com/capacitor-energy-time-calculator/)** They store electric charge and create an electric field between them.

 ![image](https://cdn.forumautomation.com/original/2X/6/63f7229fa416a8666aec4a5f3f92b71ed767da59.jpeg)

## Conductance (G)

Some current leaks through the air or insulation to the ground. This leakage is represented by **[conductance.](https://forumelectrical.com/what-is-conductivity-meter/)**

These four parameters exist along the entire length of the transmission line. Together, they decide how efficiently power travels from one place to another.