Design and Technology

Design and Technology

1. Mechanisms

   • Motion
     • Cams
       • Levers

2. Electricity

   • Flow of spare electrons through a material
   • Materials with large number of spare electrons = conductors
     • Materials with few = Insulators
       • Air, Wood, Plastic
       • Very high resistance
         • Impede flow of spare electrons
     • Gold, silver, bronze, steel, water, etc
     • Very low resistance
       • Doesn't impede flow of spare electrons
   • LED's
     • Politic [Have +/- poles] Must be connected correct way round
   • Symbols
   • Potential Dividers
   • Sensing Circuit
   • Current
     • The physical number of spare electrons moving
   • Voltage
     • The push causing the spare electrons to move
   • Transistor
     • Transistors = Switch
       • Take small current and turn into large one
         • Amplification

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