What is an insulator?

An insulator is defined as a material that prevents the flow of electricity. This is due to its atomic structure, which does not allow electrons to move freely, thereby inhibiting electrical conductivity. Insulators are commonly used in electrical applications to protect users from electric shock and to ensure that electricity flows along the intended path, rather than leaking through less conductive materials.

For example, materials like rubber, glass, and plastic are all typical insulators. They serve crucial functions in electrical systems, such as covering wires to prevent unintended contact with other conductive substances.

The other options relate to different concepts in electricity. Conductors are materials that allow electricity to flow freely, generators convert mechanical energy into electrical energy, and substances that enhance electric current flow typically refer to superconductors or other materials that lower resistance. Understanding the role of insulators within electrical systems highlights their importance in safety and efficiency.