Which term describes a material through which electrons move easily?

Which term describes a material through which electrons move easily?

• A. Electrical conductor
• B. Semiconductor
• C. Electrical insulator
• D. Resistor

Answer: (C)

A material through which electrons move easily is an electrical conductor. Conductors have many free electrons that can respond quickly to an electric field, so electrical current flows with relatively low resistance. Metals are classic examples because their atoms form a lattice with delocalized electrons that can drift when voltage is applied, like copper or aluminum in wires. In contrast, insulators hold onto their electrons tightly, so they resist current and require much higher energy to move electrons. Semiconductors have conductivities between conductors and insulators and can be tuned by temperature, impurities, or light. A resistor isn’t a type of material but a device designed to add resistance to a circuit, whereas the term describing a material’s ability to conduct is conductor.

A material through which electrons move easily is an electrical conductor. Conductors have many free electrons that can respond quickly to an electric field, so electrical current flows with relatively low resistance. Metals are classic examples because their atoms form a lattice with delocalized electrons that can drift when voltage is applied, like copper or aluminum in wires. In contrast, insulators hold onto their electrons tightly, so they resist current and require much higher energy to move electrons. Semiconductors have conductivities between conductors and insulators and can be tuned by temperature, impurities, or light. A resistor isn’t a type of material but a device designed to add resistance to a circuit, whereas the term describing a material’s ability to conduct is conductor.