Plural of ammeter: electrical instruments that measure the strength of electric current flowing through a circuit, measured in amperes or amps.
From 'ampere' (named after physicist André-Marie Ampère) plus the suffix '-meter' (from Greek 'metron,' meaning 'measure'). The term became standard in electrical engineering in the early 20th century.
An ammeter is essential because electricity is invisible—we need instruments to 'see' how much electrical current flows, just as we need thermometers to see temperature. Without ammeters, electricians would be working blind.
Complete word intelligence in one call. Free tier — 50 lookups/day.