Crossword puzzle

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Across
  1. 1. is a portable energy source
  2. 5. is the unit of electrical current
  3. 7. is an electronic device used to measure electric current
Down
  1. 2. is a position in a circuit or device
  2. 3. is an electrical discharge that momentarily ionizes the air
  3. 4. is a material or object that attracts ferromagnetic materials
  4. 6. is a type of field