Which statement correctly describes conductors and insulators in electricity?

• A. Conductors allow current to flow; insulators resist current.
• B. Insulators allow current to flow; conductors resist current.
• C. Both conduct and insulate equally; there is no difference.
• D. Conductors only work with water; insulators only with air.

Answer: (A)

Electricity moves more easily through some materials than others. A conductor has low resistance, so electric charges can flow through it readily. An insulator has high resistance, which greatly slows or blocks the flow of charges. The statement that conductors allow current to flow and insulators resist current captures this essential difference. For example, metal wires are conductors, letting current pass, while rubber coatings on wires act as insulators to keep that current from escaping and to protect people. The other choices mix up the roles or suggest there’s no difference, which isn’t accurate.