Which of the following statements about direct current is true?

Direct current (DC) is associated with higher risk than alternating current (AC) primarily due to the way it affects the body when an electrical shock occurs. DC causes a continuous flow of electricity in one direction, which can lead to sustained muscle contraction if someone comes into contact with it. This sustained contraction can make it difficult for a person to release their grip on the source of the current, increasing the risk of serious injury or fatality. In comparing AC and DC, AC typically alternates in direction, which can allow for a reflexive muscle contraction and potentially easier release from the source of electricity.

Thus, the understanding that DC tends to present a higher risk than AC due to its more consistent and unidirectional flow, which can lead to prolonged exposure to the current, underlines the importance of safety considerations when dealing with electrical systems and medical emergencies.