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(e)Ammeter, instrument for measuring either direct or alternating electric current, in amperes. An ammeter can measure a wide range of current values because at high values only a small portion of the current is directed through the meter mechanism; a shunt in parallel with the meter carries the major portion.
The rheostat is a type of variable resistor that can adjust its resistance so that the amount of power running via a circuit can be modified. It changes the magnitude of the current without interrupting the flow by adjusting the rheostat's resistance throughout the circuit.
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