Which component is typically described as the brain that performs software-defined instructions?

Which component is typically described as the brain that performs software-defined instructions?

• A. Central Processing Unit (CPU)
• B. RAM
• C. Input Device
• D. Power Supply

Answer: (D)

Software-defined instructions are carried out by the central processing unit, or CPU. The CPU is the component that runs programs by performing the fetch-decode-execute cycle: it fetches an instruction from memory, decodes what action is required, and then executes it. In doing so, it carries out calculations, makes decisions, and moves data between memory and input/output devices. The CPU includes the control unit, which directs operations, and the arithmetic logic unit (ALU), which performs arithmetic and logical operations. Memory like RAM holds the data and instructions the CPU uses while a program runs, but it doesn’t execute those instructions on its own. An input device’s role is to bring data into the system from the outside world, not to process it. The power supply provides electrical power to all components; it does not perform computation or instruction execution.

Software-defined instructions are carried out by the central processing unit, or CPU. The CPU is the component that runs programs by performing the fetch-decode-execute cycle: it fetches an instruction from memory, decodes what action is required, and then executes it. In doing so, it carries out calculations, makes decisions, and moves data between memory and input/output devices. The CPU includes the control unit, which directs operations, and the arithmetic logic unit (ALU), which performs arithmetic and logical operations.

Memory like RAM holds the data and instructions the CPU uses while a program runs, but it doesn’t execute those instructions on its own. An input device’s role is to bring data into the system from the outside world, not to process it. The power supply provides electrical power to all components; it does not perform computation or instruction execution.