Final answer:
The term that means a component can be replaced with the main power still on is hot swapping. Hot swapping is a feature that allows a device or component to be replaced or added while the system is powered on.
Step-by-step explanation:
The term that means a component can be replaced with the main power still on is hot swapping. Hot swapping is a feature that allows a device or component to be replaced or added while the system is powered on. This is commonly seen in computer hardware, such as plugging in a USB device without restarting the computer. Hot swapping reduces downtime and improves system availability.