Final answer:
An extra military instrument (EMI) can be considered as an ammeter, which is used to measure the electric current flowing through a circuit.
Step-by-step explanation:
An extra military instrument (EMI) is a type of measure that is used to measure the current electromotive force (emf) energy produced per unit charge drawn from a source that produces an electrical current. It can be considered as an ammeter, which is an instrument used in physics to measure the electric current flowing through a circuit. An ammeter measures the current produced per unit charge or the electromotive force (emf) in a circuit.