Question

a computers power supply converts main ac to low - voltage regulated dc power for the internal components. you are building a new computer, and you are deciding which type of power supply to install. which of the following definitions best describes a valid type of power supply? a dual - rail power supply provides separate rails (pcb traces) to provide equal wattage to the devices attached to each rail. a single - rail power supply provides one rail (pcb trace) to provide the best safety mechanism for the computer by having a single point of shutdown in the event of a short circuit. a dual - rail power supply provides separate rails (pcb traces) to balance the power load between multiple circuits (this prevents any one circuit from becoming over - loaded). a single - rail power supply provides one rail (pcb trace) to always provide equal wattage to all the devices attached to the power supply. i want to review this question later. (optional)

Explanation:

A dual - rail power supply has separate rails (PCB traces) to balance the power load between multiple circuits and prevent over - loading of any one circuit. A single - rail power supply doesn't have this feature for load - balancing. Also, a single - rail power supply doesn't inherently provide the best safety mechanism by shadowing in case of a short circuit and doesn't always provide equal wattage to all devices. A dual - rail power supply doesn't provide equal wattage to each device attached but rather balances the load.

Answer:

C. A dual - rail power supply provides separate rails (PCB traces) to balance the power load between multiple circuits (this prevents any one circuit from becoming over - loaded).