third number

12345678
Across
  1. 2. Electrically operated switch
  2. 5. Unit of electrical current
  3. 7. Company that provides electrical power
  4. 8. Unit of electrical resistance
Down
  1. 1. A closed loop that allows electrical current to flow.
  2. 3. The device or component that consumes electrical power.
  3. 4. A device that opens or closes an electrical pathway.
  4. 6. Overcurrent protection device