The instrument used to measure current is called _______.

Correct option is A

The correct answer is (a) Ammeter.
An ammeter is an instrument used to measure electric current in a circuit. It is typically connected in series with the circuit so that the current flowing through the circuit also flows through the ammeter.
Ammeters are designed to have very low resistance so that they do not significantly affect the current they are measuring.
The unit of measurement for electric current is the ampere (A).
Information Booster:
Voltmeter: An instrument used to measure the voltage or electrical potential difference between two points in an electric circuit. It is connected in parallel with the component whose voltage is to be measured.
Battery: A device consisting of one or more electrochemical cells that convert stored chemical energy into electrical energy. Batteries provide the power supply for various electronic devices and circuits.
Meter: A general term for any device that measures and records the quantity of a particular substance or phenomenon, such as a gas meter, water meter, or electricity meter.