Building Trades - Electrical

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Across
  1. 2. current that flows in one direction only
  2. 5. current that reverses direction at regular intervals
  3. 7. the flow of electrons
  4. 8. the negatively charged particle of an atom
Down
  1. 1. the flow of electricity through conductors
  2. 3. a machine which generates electricity
  3. 4. the "spider web" of electricity over an extremely large area
  4. 6. any material that will not allow electricity to flow through it