An unbalanced circuit is a transmission line in which the voltages on the two conductors are unequal with respect to ground, such as a coaxial cable.
An unbalanced circuit is a transmission line in which the two conductors carry voltages that are unequal with respect to ground. A coaxial cable is the classic example: its center conductor carries the signal while its outer conductor, or shield, is at or near ground potential, so the two are not symmetrical about ground. This contrasts with a balanced circuit, such as a twisted pair, where the two conductors carry equal and opposite voltages relative to ground.
Because the conductors are not symmetrical, an unbalanced circuit relies on the grounded shield to reject interference rather than on the cancellation that a balanced pair provides. Unbalanced lines like coaxial cable are well suited to high-frequency signals and are widely used in video and radio frequency applications.
In commercial and industrial systems, unbalanced circuits such as coaxial cable carry video and high-frequency signals. Recognizing the term helps in understanding how a circuit's balance relates to its construction and interference rejection.
Because the conductors are not symmetrical, an unbalanced circuit relies on the grounded shield to reject interference rather than on the cancellation that a balanced pair provides, with unbalanced lines like coaxial cable well suited to high-frequency signals in video and radio frequency applications.
At Windy City Wire, an understanding of circuit types, including unbalanced circuits, supports the selection of cable matched to the signal. Recognizing how coaxial and other unbalanced lines work helps customers choose the right cable for video and high-frequency commercial and industrial applications.