Question

identifying direct current
direct current is produced by
an electric motor.
an armature.
a solenoid.
a battery.

Explanation:

An electric motor converts electrical energy to mechanical energy. An armature is part of an electric - motor or generator. A solenoid is an electromagnet made from a coil of wire. A battery is a source of direct current as it provides a constant flow of electrons in one direction.

Answer:

D. a battery