how does galvanometer measure the magnitude of current when it is converted into an ammeter?
http://www.citycollegiate.com/galvanometer_XIIa.htm The information here should help you answer the question.
A galvanometer is a current measure device. But it is designed to work with small currents. To use it as an ammeter you have to put a resistance in series with it, to put a limit on the max current that the device can stand.
A galvanometer is converted to an ammeter by connecting a 'shunt' resistance in parallel with the galvanometer. The shunt resistance bypasses most of the current that is being measured and prevents the galvanometer from being overloaded. To use a galvanometer as a voltmeter a suitable resistance is connected in series with the galvanometer.
You're right, kropot72
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