An instrument that measures the total amount of electrical charge that has passed through a circuit by measuring the amount of a substance that has been chemically deposited or dissolved.
From coulomb + meter (from Greek metron, meaning 'measure'). The device integrates current over time to determine total charge transferred.
Coulometers work by causing metals to electroplate onto an electrode—basically, the more charge flows, the heavier the metal coating gets, so you just weigh it to know how much charge passed through!
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