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Electricity Explained: Discovering Conductors, Semiconductors, and Circuits

Explore the fascinating world of electricity through robots, electric eels, and circuits! Learn about conductors and semiconductors, how tiny particles move in circuits, and the importance of safety precautions. Discover the thrilling game of completing circuits and the role of materials like metals, carbon, wood, and plastic. Unravel the secrets of LEDs and their various applications, from traffic lights to sensors. Get ready for an electrifying journey into the realm of electricity!

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Electricity Explained: Discovering Conductors, Semiconductors, and Circuits

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  1. Robots and electric eels Electricity

  2. Aforest

  3. trees

  4. What can you see?

  5. Do they stay still?

  6. No !

  7. Now a game ----

  8. When the circuit is complete tiny particles move round the circuit. The particles are very, very, very, very, very, very, very, very, very tiny!

  9. Drawing circuits • A battery • A lamp

  10. The circuit you connected There is a battery and a complete loop of conducting material.

  11. Which materials are good conductors?

  12. Electricity makes us work

  13. Electrophoridae electric eel

  14. OW !

  15. Water conducts electricity

  16. metal Light pressure – very few contact points Skin is rough

  17. metal Heavy pressure – many contact points Press

  18. Wet skin metal Water increases contact area between skin and metal

  19. Safety • Never touch electric appliances or switches with wet hands! • If we get a shock we will not work properly any more! • When we do experiments we use small batteries NOT mains electricity!

  20. No switches in a bathroom X

  21. Changes

  22. Look at the lump on top of the lamp • When it goes dark the street lamp comes on. • Special materials are used which change from good conductors to poor conductors. • The materials are semi-conductors

  23. Semi-conductors have lots of uses

  24. LEDs

  25. New traffic lights

  26. What have we learned? • When a current flows, tiny particles move round the circuit. • Conductors allow a current to flow through them • Metals, carbon, water, - - - - • Insulators do not allow a current to flow through them • Wood, plastic, paper, - - - - -

  27. Some materials can be conductors and insulators! • These are semi-conductors • They are very useful as • sensors - when changes occur they can switch things on or off • LEDs – used in traffic lights • and lots and lots more uses ---

  28. Electricity

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