AMMETER AND VOLTMETER
AMMETER:- An ammeter is an instrument foe measuring the currents and it is calibrated to read the values of current directly.the ammeter is always connected in series in the circuit in which current is to be measured. since it is an instrument of very low Resistance,it does not alter the value of the current in the circuit.a moving coil galvanometer can easily be change into the ammeter by placing a low resistance shunt in parallel with galvanometer.
VOLTMETER:- The voltmeter is an instrument to measure potential difference between two points and it is always connected across the two points,parallel to main current.in order that the voltmeter does not draw any appreciable current from the main current , the voltmeter should be an instrument of very high resistance. a moving coil galvanometer is converted into voltmeter by connecting a high resistance in series with galvanometer of resistance G
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