PSU stands for which expansion?

• A. Private Storage Unit
• B. Power System Unit
• C. Peripheral Storage Unit
• D. Power Supply Unit

Answer: (D)

PSU refers to the component that converts AC from the wall into the DC voltages used by all computer components. That makes the expansion "Power Supply Unit"—the standard term for this part in PC hardware. Other phrases like Private Storage Unit, Peripheral Storage Unit, or Power System Unit aren’t recognized PC components and don’t describe the function of providing power. A PSU supplies the necessary rails and power through connectors to the motherboard, CPU, drives, and other hardware, and it’s rated by wattage and efficiency. So the correct expansion is Power Supply Unit.