What is the function of an insulator in electrical lines?

The correct answer identifies the primary purpose of an insulator in electrical lines, which is to prevent electrical current from escaping. Insulators are materials that inhibit the flow of electric current, allowing them to effectively maintain the designed pathway of electricity within conductors. By minimizing leakage, insulators ensure that electrical energy is confined to the intended circuits and does not dissipate into the surrounding environment. This function is crucial for maintaining the efficiency of electrical systems and enhancing safety by reducing the risk of electrical hazards.

In contrast, some choices imply various functions that do not align with the role of an insulator. For instance, enhancing voltage would suggest that an insulator somehow boosts the electrical potential, which is not their function. Amplifying current flow also misrepresents insulators, as they are designed to resist and contain current, rather than increase it. Storing electrical energy typically pertains to components like capacitors or batteries, which is unrelated to the passive role of an insulator. Through this understanding, it becomes clear why the selected answer accurately reflects the insulator's function.