Which material is considered an electrical insulator?

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Prepare for the NCCER Introduction to Electrical Circuits exam. Engage with flashcards and multiple-choice questions, each with hints and explanations. Get ready for your success!

Multiple Choice

Which material is considered an electrical insulator?

Explanation:
Electrical insulators resist the flow of current; they have high resistance so electrons don’t move freely through them. Metals like copper and steel conduct electricity, so they’re not insulators. Glass is an insulator, but porcelain—a ceramic material—has especially high dielectric strength and low moisture absorption, which gives it reliable insulation under a variety of conditions and voltages. That combination of strong insulating properties and durability makes porcelain the best choice here.

Electrical insulators resist the flow of current; they have high resistance so electrons don’t move freely through them. Metals like copper and steel conduct electricity, so they’re not insulators. Glass is an insulator, but porcelain—a ceramic material—has especially high dielectric strength and low moisture absorption, which gives it reliable insulation under a variety of conditions and voltages. That combination of strong insulating properties and durability makes porcelain the best choice here.

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