Magnetic reed relays

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Across
  1. 2. - devices that open or close an electrical circuit when a magnetic field is near
  2. 4. - in comparison to something else
  3. 5. - a rotating part of an electric motor or generator
  4. 6. - usually or most of the time
  5. 8. - made to move or operate
  6. 10. - worries about how human activities affect nature
  7. 11. - a loop of wire used in electronic devices
  8. 12. - devices used to control electrical circuits
Down
  1. 1. - a small spool or cylinder for holding thread or wire
  2. 3. - a type of magnet that is created by electricity
  3. 7. - thin pieces of metal that touch each other to complete an electrical circuit
  4. 9. - particularly or more than usual
  5. 11. - damage caused by chemical reactions, especially on metal surfaces