What polarity is assumed when tracing a circuit?

When tracing a circuit, the assumed polarity is often considered to be positive. In many electrical contexts, especially when using schematic diagrams, positive polarity indicates the direction of conventional current flow, which is from positive to negative. Understanding polarity is critical for correctly analyzing circuit behavior and ensuring components are connected in the intended manner.

Positives and negatives dictate how components like diodes, transistors, and capacitors function, as they typically have inherent directional characteristics based on the voltage polarity applied. Therefore, when tracing a circuit, identifying the positive terminal and following the paths of current flow can provide clarity on how the circuit operates or where issues might arise.

The other options such as zero and sine don't hold as conventions for polarity in circuit tracing, as zero represents a state with no voltage difference and sine indicates a waveform rather than a polarity in a circuit context.