explain sensitivity of ammeter.....
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An ammeter (from ampere meter) is a measuring instrument used to measure the current in a circuit. Electric currents are measured in amperes (A), hence the name. Instruments used to measure smaller currents, in the milliampere or microampere range, are designated as milliammeters or microammeters. Early ammeters were laboratory instruments that relied on the Earth's magnetic field for operation. By the late 19th century, improved instruments were designed which could be mounted in any position and allowed accurate measurements in electric power systems. It is generally represented by letter 'A' in a circuit.
Ammeters work to measure electrical current by measuring the current through a set of coils with a very low resistance and inductive reactance. ... You must connect an ammeter in series when measuring the current of a circuit. The low impedance of the ammeters means it won't lose much power.