Electrical Measurements & Measuring instruments Puzzle-1

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Across
  1. 1. Closeness to the true value
  2. 3. A scale in MI instruments
  3. 5. instruments which measures only DC quantity
  4. 9. This is low parallel resistance used for extension of range in ammeters
  5. 11. An acceptable range of error
  6. 13. A coil in wattmeter which is connected across the voltage
  7. 15. instruments which measures both DC & AC quantities
  8. 16. instruments which keeps record of the variation of quantity over the period
  9. 17. The torque required to reduce oscillations
  10. 18. A coil which carries current in wattmeter
  11. 19. instruments which measures energy
Down
  1. 2. A type of damping torque
  2. 4. This is high series resistance used for extension of range in voltmeters
  3. 6. The torque required to reset the pointer
  4. 7. instruments which measures power
  5. 8. Instruments which is used as a transfer instrument
  6. 10. instruments which measures total quantity over the period
  7. 12. A type of controlling torque
  8. 14. The most efficient damping