Which term refers to materials that do not allow electricity to pass through easily?

• A. Conductors
• B. Insulators
• C. Matter
• D. Compounds

Answer: (B)

Materials that do not allow electricity to pass through easily are insulators. This reflects electrical resistance: insulators have high resistance, so electrons can’t move freely and the current is hindered. The atoms in insulators hold onto their electrons tightly or their structure creates a large barrier to charge flow, which is why they resist conduction. That’s why we use insulators like plastic, rubber, and wood to keep currents contained and protect people and devices. In contrast, conductors let electricity flow easily, and matter and compounds are broad categories that include both insulating and conductive substances, depending on their structure and state.