AVIXA Recognized AV Technologist Test

What type of circuit is illustrated in the graphic below?

1. Balanced

2. Parallel

3. Series

4. Unbalanced

The correct answer is: Balanced

The indicated circuit type is balanced, which means it is designed to minimize interference and noise during signal transmission. Balanced circuits employ a technique that uses two conductors to carry signals in opposite phases. This configuration helps to cancel out any electromagnetic interference that may affect the signal during transmission, providing a cleaner and clearer audio or data signal at the receiving end. Balanced circuits are commonly used in professional audio applications, as they can effectively reduce the detrimental effects of environmental noise. The two conductors usually carry equal but opposite signals, which allows for noise that affects both lines symmetrically to be negated when the signals are combined at the receiving equipment. In contrast, an unbalanced circuit typically uses a single conductor and a ground, making it more susceptible to noise. A series circuit involves components connected end-to-end, forming a single path for current, while a parallel circuit has multiple pathways for current to flow. Therefore, the characteristics unique to a balanced circuit—like the use of twisted pairs and differential signaling—are essential for performance in high-quality audio and data applications.