Which term describes materials through which heat or electricity passes easily?

• A. Insulators
• B. Efficiency
• C. Conductors
• D. Closed System

Answer: (C)

Materials through which heat or electricity passes easily are conductors. This happens because in conductors, especially metals, electrons can move freely, allowing electrical current to flow with little resistance and heat to transfer quickly through the material. That’s why things like copper wires conduct electricity well and metals transfer heat efficiently. Insulators resist the flow of heat and electricity, so they don’t pass energy easily. Efficiency is about how well energy is converted or used, not about how a material transmits energy. A closed system describes a situation where there’s no matter or energy exchange with the surroundings, not a property of a material’s ability to conduct.