The significance of the 550W in the 6th item (Zoltz 550W) is output power.
Step-by-step explanation:
The unit that is essential to provide power for the working of computer refers to the power supply unit. This will take the electricity that is essential for the working of computer and this will be converted in Direct current. It is very helpful in regulating the fluctuations that may damage the computer.
They are usually determined based on the amount of watts they will be producing. When the computer has more power it requires more watts for the working of its parts. In the options given, the significance of the sixth item which is Zoltz 550W will be the output power.