What term refers to a straight portion of a line in electrical terms?

The term that refers to a straight portion of a line in electrical terms is "segment." In the context of geometry and technical drawings, a segment typically describes a part of a line or curve that is straight. This is especially relevant in electrical diagrams where clear, defined paths are necessary for understanding how circuits are laid out or how electricity flows through certain components.

While "line" might seem like a suitable answer, it generally refers to an indefinite extent in either direction, not exclusively a straight portion. "Tangent" refers to a line that touches a curve at a single point without crossing it, which is not necessarily straight throughout its entirety. "Arc" denotes a curved line, which also does not align with the concept of a straight portion.

Therefore, the proper terminology for a straight section of a line within the realm of electrical terminology is indeed a segment.