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Design and Technology

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KS4 (GCSE) Year 8 (DT) Mind Map on Design and Technology, created by Oliver H on 22/04/2014.
Oliver H
Mind Map by Oliver H, updated more than 1 year ago
Oliver H
Created by Oliver H over 10 years ago
114
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Resource summary

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

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