Why Are High Voltage Power Line Cables So Thin?

High-voltage power lines are thin because they are designed to reduce energy loss in the form of heat due to the resistance of the wires.

The thinner the wire, the lower the resistance to the passage of electricity, and the less energy is given off in the form of heat.

High-voltage lines are also made of electrically conductive materials such as copper and aluminum.

Since these materials are expensive, costs can be reduced by using fewer of them and reducing the thickness of the wires.