Which term refers to materials that allow electricity to pass through easily?

• A. Insulators
• B. Elements
• C. Conductors
• D. Matter

Answer: (C)

The concept being tested is electrical conductivity: which materials let electric current flow easily. Conductors are those materials. They have electrons that can move readily when a voltage is applied, so charge travels through the material with relatively little resistance. Metals like copper are classic examples because their outer electrons aren’t tightly bound and can form a current-carrying flow.

Insulators, by contrast, hold their electrons tightly, so they resist the movement of charge and current doesn’t flow easily through them. The word matter is too general for describing how well a material conducts, and while elements describe what a substance is made of, they don’t specify how well it conducts—some elements conduct well and some don’t. So the term that directly names the materials that allow electricity to pass through easily is conductors.