An older or alternative term for an ammeter, an instrument that measures electric current in amperes.
Compound of 'ampere' + 'meter' (from Greek 'metron' meaning 'measure'). This is a less common variant of 'ammeter,' reflecting different naming traditions in early electrical engineering.
Early electrical engineers had to invent the names for their measuring tools on the fly—'amperometer' shows how language evolved as each discovery needed a new word.
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