Which term describes a material in which electrons are not able to move easily?

Which term describes a material in which electrons are not able to move easily?

• A. Conductor
• B. Insulator
• C. Semiconductor
• D. Dielectric

Answer: (B)

Electrical conductivity depends on whether electrons can move freely under an electric field. In insulators, electrons are tightly bound to atoms, and the energy needed to free them into a conduction path is large. At everyday temperatures there are very few free charge carriers, so the material resists current and electrons cannot move through it easily. That makes insulators the best descriptor for a material where electron movement is not easy. Conventional conductors have many free electrons that readily respond to an electric field, so current flows easily. Semiconductors have intermediate, tunable conductivity depending on temperature and dopants. Dielectrics are insulating materials that primarily polarize in an electric field rather than conduct, often used to store energy in capacitors. The term that best captures the notion of electrons not moving easily is insulator.

Electrical conductivity depends on whether electrons can move freely under an electric field. In insulators, electrons are tightly bound to atoms, and the energy needed to free them into a conduction path is large. At everyday temperatures there are very few free charge carriers, so the material resists current and electrons cannot move through it easily. That makes insulators the best descriptor for a material where electron movement is not easy.

Conventional conductors have many free electrons that readily respond to an electric field, so current flows easily. Semiconductors have intermediate, tunable conductivity depending on temperature and dopants. Dielectrics are insulating materials that primarily polarize in an electric field rather than conduct, often used to store energy in capacitors. The term that best captures the notion of electrons not moving easily is insulator.