What is the role of an insulator in electrical systems?

The role of an insulator in electrical systems is primarily to prevent unwanted flow of electricity. Insulators are materials that do not conduct electricity well, which means they can effectively block or impede the movement of electric current. This characteristic is crucial for ensuring safety and functionality within electrical systems, as they help to protect both the wiring and the surrounding environment from unintended electrical conduction that could lead to short circuits or electrical shocks.

By containing the flow of electricity within designated pathways, insulators play a vital part in maintaining the efficiency and safety of electrical devices and systems. They are often used in various applications, such as coating wires, supporting electric circuits, and providing barriers between different conductive parts. This prevents energy loss and protects sensitive electronic components from damage caused by stray currents.

The other options do not accurately describe the function of insulators. Enhancing electricity flow and allowing free flow of current contradict the primary purpose of an insulator, while increasing voltage levels is not directly related to the role of insulators in controlling electricity flow.