“Arithmetic Logic Unit” is the full form of ALU. It is the component of a computer that conducts all arithmetic operations, including addition, multiplication, and comparison. The ALU (Arithmetic Logic Unit) is the essential building component of a computer’s CPU (Central Processing Unit). ALUs on modern CPUs are complicated and powerful. In addition to ALUs, modern CPUs have a CU (control unit).

What is an ALU and How Does It Work?

Basic arithmetic and logic operations are performed by the ALU. Addition, subtraction, multiplication, and division are examples of arithmetic operations. Comparisons of values, such as NOT, AND, and OR, are examples of logic operations. The CPU controller, main memory (RAM in a PC), and input/output devices all have direct input and output access to an ALU. A bus is an electronic path that connects inputs and outputs.

In a computer, all information is stored and handled as binary integers, or 0 and 1. Because a switch can only have two states: open or closed, transistor switches are used to alter binary numbers. A 0 signifies an open transistor with no current flowing through it. A closed transistor is one that has a current flowing through it.


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