This ampere hour meter sends the current through a magnet, creating a magnetic field. The strength of this field changes in direct proportion to the strength of that current. This magnetic field causes an indicator attached to a small magnet to move in proportion to its strength. A mechanical counter registers the position of the needle every 2.5 minutes and increases the counter accordingly. The meter gives a reading in ampere-hours: a measure of electric charge. This unit is used for purposes such as indicating the capacity of batteries.


  • Title: Ammeter
  • Creator: Siemens & Halske
  • Physical Dimensions: 55 x 24 x 16 cm (h x w x d)
  • Original Language: English
  • Type: object
  • Rights: NEMO Science Museum
  • Medium: wood, metal

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