In a schematic diagram of a DC source, how is the positive terminal indicated?

• A. the smaller bar
• B. the larger bar
• C. the curved line
• D. the color red

Answer: (B)

The positive terminal is shown by the longer bar. In the two-bar symbol used for a DC source, the longer line represents the positive side while the shorter line is the negative. This visual cue makes it clear which side has higher potential and should be connected to the load’s positive side. Colors aren’t part of the symbol itself, and a curved line isn’t used to indicate polarity in this context.