Review

• Name the four parts of a circuit

• What material is the wire made out of?

• Would the circuit work if the wire was made out of plastic?

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Conductors

• A conductor is a material through which electric charges can easily flow

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Conductors

• Many of the wires in your homes are made of copper or aluminum– They CONDUCT

electricity– Of all metals, silver is

the best conductor, but it costs more than copper or aluminum

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Conductors

• Conductors are made of atoms that hold their electrons loosely– That way, electrons can move easily from atom to

atom

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Examples of Conductors

*Conductors also refer to sound and heat*

Copper IronGold

WaterAluminum

Steel silver

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Insulators

• An insulator is a material through which an electric charge cannot easily flow

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Insulators• Copper wires are

usually coated with plastic or rubber– This coating is an

insulator, making it safe to touch

– Most electrical power lines do not have insulation around them

• Workers have to use insulated tools

• If you see a fallen power line, tell an adult. DO NOT TOUCH IT! © LoveLearning

2014

Insulators

• Insulators have atoms that hold the electrons tightly– A charge barely moves

through an insulator

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Examples of Insulators

Most plasticsGlassClothSand

RubberWoodDry air

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© LoveLearning 2014

Conductors and Insulators

• http://www.bbc.co.uk/schools/scienceclips/ages/8_9/circuits_conductors_fs.shtml

• http://www.bbc.co.uk/bitesize/ks2/science/physical_processes/circuits_conductors/play/

© LoveLearning 2014

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