Ans. GALVANOMETER
A galvanometer is very sensitive instrument and can detect small current in a circuit.
A current of few million peres is sufficient to cause full scale deflection in a galvanometer. An ideal galvanometer should have very small resistance to pass the maximum current in the circuit. A galvanometer is always connected in series.
AMMETER
An ammeter, is a current measuring instrument.
A large current of the range such as 1A or 10A can be measured by means of an ammeter. An ammeter is connected in series, so the current flowing in the circuit also passes through the ammeter.