The equipment used to measure the electrical current in a closed circuit is

The correct answer is Ammeter. An ammeter is a measuring instrument used to measure the electric current in a circuit. The name is derived from the unit of current, the Ampere (A). To measure current, an ammeter must be connected in series so that the full current of the circuit passes through it.

• Galvanometer: Primarily used to detect the presence and direction of very small electric currents rather than measuring large magnitudes.
• Voltmeter: Used to measure the electrical potential difference (voltage) between two points in a circuit and is connected in parallel.
• Compass needle: Can detect the magnetic field generated by a current (Oersted's effect) but is not a standard tool for measuring the magnitude of the current.