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Electrical Conductors And Insulators
 

Electrical Conductors And Insulators

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    Electrical Conductors And Insulators Electrical Conductors And Insulators Presentation Transcript

    • Electrical conductors and insulators
    •  An electric circuit is a path along which current flows.  Current can only flow through a closed circuit.  Battery provides energy in a closed circuit and current transports energy from the battery to the bulb.
    • Do all materials allow electricity to flow through them? What kind of materials allow electricity to flow through them?
    • Identify electrical conductors and electrical insulators.
    • Infer that good conductors of electricity are generally good conductors of heat.
    • Heat conductors are materials that allow heat to pass through it easily. Examples: Metals - silver, iron, copper, aluminum. Silver Copper
    • Electrical conductors are materials that allow electric current to flow through.
    • What types of materials are good electrical conductors? Alumiuium? Rubber? Wood?
    • Electrical insulators are materials that do not allow electric current to flow through.
    • What types of materials are electrical insulators? Glass? Pencil lead?
    • Use of a circuit tester: To test whether the material is a good electrical conductor. Example of a circuit tester
    • Step 1: Set up the circuit Step 2: Place the object tester as shown above. between the open ends of the wire or crocodile clips.
    • If the bulb lights up, it means the material allows electric current to flow through the closed circuit.  The brighter the bulb, the better the conductor of electricity is the material.
    •  Place the two aluminum plates into the liquid tested.  If the bulb lights up, a closed circuit is formed, allowing current to flow through it.  The liquid is a conductor of electricity.
    •  Electrical conductors are materials that allow electric current to flow through. Examples: salt water, metals such as copper, aluminium and non-metals like graphite (a form of carbon). Copper Aluminium Graphite
    •  Good electrical conductors are generally good heat conductors. Examples: steel, iron
    •  Electrical insulators are materials that do not allow electric current to flow through. Examples: plastics, wood, rubber, glass. plastic rubber