ABYC Marine Electrical Practice Exam

In electrical systems, what property does an insulator primarily exhibit?

1. High thermal conductivity

2. Low electrical conductivity

3. High electrical conductivity

4. Low thermal resistance

The correct answer is: Low electrical conductivity

An insulator primarily exhibits low electrical conductivity, which is the defining characteristic that makes materials effective for insulating applications. Insulators are designed to resist the flow of electrical current, preventing it from passing through them easily. This property is essential in ensuring safety and preventing short circuits in electrical systems, particularly in marine environments where moisture and corrosion can exacerbate electrical hazards. Materials with low electrical conductivity, such as rubber, glass, and certain plastics, are commonly used to coat wires and build electrical components, ensuring they do not conduct electricity and protect both the users and the equipment from electrical shock or failure. This fundamental property stands in contrast to conductors, which have high electrical conductivity and are intended to facilitate the flow of electric current.