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## ALU Full Form and Definition

The **ALU Full Form** is an **arithmetic and logic unit**. In computing, an ALU is a digital circuit that performs arithmetic and logical operations. An ALU is the part of a pc chip that carries out arithmetic and logic operations on the operands in computer instruction words. In some processors, the ALU is divided into two components an arithmetic unit and a logic device. The inputs to an ALU are the data to be operated on known as operands and code indicating the operation to be done. The ALU’s output is the outcome of the completed operation. In most designs, the ALU has status inputs or outputs or both which transmit details about a former operation or the current operation correspondingly between the ALU and status registers.

### How an ALU Works.

An ALU performs **basic arithmetic and logic operations**. Samples of arithmetic operations are addition, subtraction, multiplication, and division. Samples of logic operations are comparisons of values like NOT, AND, and OR. All info in a pc is stored and manipulated in the shape of binary numbers, i.e. 1 and 0. Transistor switches are utilized to manipulate binary numbers because there are only two possible states of a switch: open or closed. An open transistor through which there isn’t any current represents a 0. A closed transistor through which there’s a current represents 1. Operations can be performed by connecting several transistors.

One transistor may be utilized to control the second one – in effect turning the transistor switch on or off depending upon the condition of the second transistor. This can be referred to as the gate since the arrangement may be utilized to allow or stop the current.

#### History

**Mathematician John von Neumann** suggested the ALU concept in 1945 in a report on the foundations of a brand new computer called the EDVAC. The cost size and energy consumption of electronic circuits was high through the infancy of the information age.

Consequently, lots of computers that are early and all sequential computers like the PDP-8 had a simple ALU which functioned on one data bit at a time even though they frequently presented a wider word dimension to programmers.[/et_pb_text][/et_pb_column]

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