Which term describes a substance that can conduct electricity under some conditions?

Which term describes a substance that can conduct electricity under some conditions?

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

Answer: (D)

Some substances can carry electricity only under certain conditions because their ability to move charge carriers changes with factors like temperature, light, or impurities. Semiconductors have this tunable conductivity: their charge-carrier density can be increased by heating, shining light, or adding impurities (doping). This makes them conduct electricity more when you want them to, while they can act more like insulators in other situations. That mixed behavior sits between typical conductors and insulators and is exactly what enables electronic devices such as diodes and transistors. An insulator hardly conducts at all, a conductor lets current flow freely, and a resistor is a component that limits current. So the term that describes a substance that can conduct electricity under some conditions is semiconductor.

Some substances can carry electricity only under certain conditions because their ability to move charge carriers changes with factors like temperature, light, or impurities. Semiconductors have this tunable conductivity: their charge-carrier density can be increased by heating, shining light, or adding impurities (doping). This makes them conduct electricity more when you want them to, while they can act more like insulators in other situations. That mixed behavior sits between typical conductors and insulators and is exactly what enables electronic devices such as diodes and transistors. An insulator hardly conducts at all, a conductor lets current flow freely, and a resistor is a component that limits current. So the term that describes a substance that can conduct electricity under some conditions is semiconductor.