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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.
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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