Direct current (DC) is best described as:

Direct current (DC) is best described as:

• A. Electricity flows in one direction
• B. Electricity circulates in a loop
• C. Direction reverses periodically
• D. Voltage is zero

Answer: (A)

Direct current is defined by a unidirectional flow of electric charge. The voltage polarity stays fixed over time, so the current does not reverse direction. This is what sets DC apart from alternating current, where the direction reverses periodically. While a circuit does require a closed path for current to flow, the defining feature of DC is the single, steady direction of flow, not the idea that it simply moves in a loop. The voltage being zero would mean no driving force to move charge, which isn’t the case for DC—DC sources provide a constant, nonzero potential difference to push the current.

Direct current is defined by a unidirectional flow of electric charge. The voltage polarity stays fixed over time, so the current does not reverse direction. This is what sets DC apart from alternating current, where the direction reverses periodically. While a circuit does require a closed path for current to flow, the defining feature of DC is the single, steady direction of flow, not the idea that it simply moves in a loop. The voltage being zero would mean no driving force to move charge, which isn’t the case for DC—DC sources provide a constant, nonzero potential difference to push the current.