ammeter

n. instrument used to measure the rate of flow of an electric current

An ammeter is a measuring instrument used to measure the flow of electric current in a circuit. Electric currents are measured in amperes, hence the name. The word "ammeter" is commonly misspelled or mispronounced as "ampmeter" by some.The earliest design is the D'Arsonval galvanometer or moving coil ammeter. It uses magnetic deflection, where current passing through a coil causes the coil to move in a magnetic field. The voltage drop across the coil is kept to a minimum to minimize resistance across the ammeter in any circuit into which it is inserted.
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Noun
1. a meter that measures the flow of electrical current in amperes
(hypernym) meter
(hyponym) milliammeter

(n.)
A contraction of amperometer or amperemeter.
  

ammeter /'æmitə/
danh từ (điện học) cái đo ampehatwire (thermal) ammeter: cái đo ampe nhiệt điệnelectromagnetic ammeter: cái đo ampe điện từ
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