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ELECTRONICS (Switches (Series (for safety), Parallel (for easy operations)…

- - - - calculator
  - - - eg. air conditioning
- - - - silver
      - gold
      - most metals
  - - - wood
      - most plastics
  - - - silicon
      - germanium
- - - - cost effective over long distance
  - - - required for most products
  - - - series
      - parallel
  - - - environmental friendly
- - - - security circuits
  - - - sensor
  - - - keypads