Which term best describes a material that allows current to flow readily in a circuit?

• A. Insulator
• B. Conductor
• C. Resistor
• D. Switch

Answer: (B)

The ability of a material to let electric charges move easily is described by its conductivity. A conductor has many free electrons that can drift in response to an electric field, giving low resistance and allowing current to flow readily through the material. Insulators resist current because their electrons are tightly bound and don’t move easily. Resistors are components that purposely add resistance to limit current, not a material property. Switches control whether current can flow by opening or closing the circuit, but they’re not describing a material’s inherent ability to conduct. So, the term that best fits a material that allows current to flow readily is conductor.