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An Ammeter is a measuring instrument used to measure the flow of electric current in a circuit?. The most common implementation uses magnetic? deflection, where increased current passing through a coil causes a small magnet to be increasingly deflected. The deflective force operates against a spirally wound spring such that instrument reurns to zero when the current is switched off. |
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An Ammeter is a measuring instrument used to measure the flow of electric current in a circuit?. The most common implementation uses magnetic? deflection, where increased current passing through a coil causes a small magnet to be increasingly deflected. The deflective force operates against a spirally wound spring such that instrument reurns to zero when the current is switched off. A key design parameter is that the voltage drop across the coil is kept to a minimum thereby causing minimal distrubance to any circuit into which the meter is inserted. |
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One problem with the use of an ammeter is the need for the meter to be inserted into the circuit and become part of it. For use in [high voltage]? circuits a special design allows the meter to form a single turn around one of the circuit conductors and through the [inductive coupling]? a small current is induced in the meter circuit. |
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