In a circuit producing both positive and negative voltages, which is true about the single source Vs?

In a circuit that is designed to produce both positive and negative voltages from a single source, the source must be capable of supplying voltage above and below a certain reference point, typically ground. This functionality is essential in various applications where dual supply voltages are needed, such as operational amplifiers, analog signal processing, or powering certain types of sensors.

When the source is specified to produce both positive and negative voltages, it usually means that the voltage can swing above a reference level (positive) and below that level (negative). For instance, if the reference is ground (0V), a source can generate +5V (positive) and -5V (negative), effectively creating a bipolar supply from a single voltage rail.

This capability aligns with what is needed in applications where varying signal levels are critical, enabling the circuit to handle both types of voltage swings without requiring multiple voltage sources. Therefore, the option indicating that the single source produces both positive and negative voltages accurately reflects the function of such a circuit, highlighting its versatility in electrical design.