Which of the following is considered an insulator?

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Multiple Choice

Which of the following is considered an insulator?

Explanation:
Electricity flows easily through materials that have many free electrons or ions, while insulators resist that flow. An insulator has high resistance because its electrons are tightly bound and not free to move. Glass fits this role well: its molecular structure holds electrons tightly, so only a tiny current can pass when voltage is applied. That’s why glass is used to insulate wires and components. Metals like copper and steel have lots of free electrons, so they conduct electricity readily. Water conducts electricity when impurities or ions are present, so it isn’t considered an insulator in practical terms.

Electricity flows easily through materials that have many free electrons or ions, while insulators resist that flow. An insulator has high resistance because its electrons are tightly bound and not free to move. Glass fits this role well: its molecular structure holds electrons tightly, so only a tiny current can pass when voltage is applied. That’s why glass is used to insulate wires and components. Metals like copper and steel have lots of free electrons, so they conduct electricity readily. Water conducts electricity when impurities or ions are present, so it isn’t considered an insulator in practical terms.

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