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Conductors
Conductors allow electricity flow through them. Conductors are materials that can carry electricity - they conduct electricity. Metal materials such as copper, iron, steel and aluminium are all good conductors of electricity. Therefore metals are good electrical conductors.
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Insulators
Insulators do not allow electricity to flow through them. Materials such as wood, plastic, rubber and glass do not carry electricity and are called insulators : they don't conduct electricity.
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