CompTIA A+ Core 1 (220-1001) Practice Exam 2026 – Complete Test Prep

The correct response is the memory module (DIMM), as it is specifically designed to expand a computer's RAM capacity. DIMMs (Dual Inline Memory Modules) are the physical modules that contain the dynamic random-access memory (DRAM) chips. By installing additional DIMMs into the memory slots on the motherboard, users can effectively increase the system's available memory, which enhances the overall performance of the computer, especially during multitasking or running memory-intensive applications.

In contrast, the hard drive is used for storage, specifically for saving files and software but does not influence the volatile memory capacity used for active processes. The power supply provides electrical power to all components of the computer and does not directly relate to memory capacity. The CPU, or central processing unit, handles calculations and processes instructions but also does not serve the purpose of increasing RAM. Thus, the memory module is the only component listed that directly impacts the amount of RAM available in a system.