Explain the role of an insulator in overhead power lines.

An insulator plays a crucial role in overhead power lines by preventing electrical current from leaking to the ground. This is essential for safety and operational efficiency. Insulators are made from materials that are poor conductors of electricity, which allows them to provide a barrier between the live conductors and the supporting structures, typically made of metal. By doing this, they ensure that the electrical energy remains confined within the conductors, reducing the risk of electrical shocks and short circuits that could lead to hazardous situations.

Proper insulation allows the overhead lines to maintain their integrity and function correctly without introducing safety risks to the public or equipment. The effective use of insulators also contributes to the overall reliability of the power distribution system, enabling the safe transmission of electricity over long distances.

The other choices mention enhancing conductivity, increasing voltage levels, or supporting the lines directly, which do not accurately reflect the primary function of insulators. Instead, the main role lies in their ability to isolate the conductor from the ground, thus managing the flow of electrical current safely.