"The body of the computer is made from a metal box" is an active voice.
An active voice can be defined as a form of verb in which the subject of a sentence performs the verb's action. Thus, an active voice simply means that subject of the sentence actively performs the action stated by its verb.
This ultimately implies that, a subject actively performs the action of the verb and it can take a direct object when an active voice is used. Also, the construction of an active voice always takes this form:
In this context, The body of the computer (subject) is made (verb) from a metal box (object) is an active voice.
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