D.C. stands for which term in electrical systems?

• A. Dynamic Current
• B. Direct Circuit
• C. Data Communication
• D. Direct Current

Answer: (D)

Direct Current means current that flows in one direction with a constant polarity. This unidirectional flow is what the term describes, which is why it’s used to specify circuits and power sources like batteries and DC power supplies. In DC, the voltage doesn’t reverse sign, so electronic components that need a steady, predictable voltage can operate reliably. This contrasts with alternating current, where the direction and polarity continuously reverse.

The other options aren’t standard terms for this concept: dynamic current isn’t a recognized designation, a direct circuit isn’t a proper term for describing current type, and data communication refers to transmitting information rather than describing the nature of electric current.