Which of the following instrument is used to measure amount of current in an electrical circuit?

Ammeter

Electric current: If a net charge Q, flows across any cross-section of a conductor in time t, then the current I, through the cross-section is

I = \(\frac{Q}{t}\)

The electric current is expressed by a unit called ampere (A).

An instrument called ammeter measures electric current in a circuit. It is always connected in series in a circuit through which the current is to be measured.