Electrical conductor

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Copper wire as one of electrical conductor

A conductor is a material which electricity, heat or sound can flow through.

Most metals, like iron and copper, are electrical conductors. These metals are used to make wires. Plasma is an excellent conductor of electricity and is used for many purposes.

Some materials are semiconductors. This means that electricity can flow through them, but not very well.

Some materials are resistors. This means that they make it very hard for electricity to flow through them.

Some materials are insulators. This means that they stop electric current completely. Wires are covered with insulators like plastic to stop the electricity from leaving the wire.

Some materials when really cold, are superconductors. They offer no resistance at all to the flow of electricity.