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# How do you explain an arithmetic logic unit?

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### Quick Answer

An arithmetic logic unit is a digital circuit that performs arithmetic and Boolean logic operations. It is one of the fundamental building blocks of modern central processing units.

Know MoreArithmetic operations that ALUs can perform are addition, subtraction, multiplication and division. Logic operations include inversion of single values and comparison of two or more values in NOT, AND and OR operations.

A control unit fetches data and desired operation type from main memory before relaying this information to the ALU for treatment. Most ALUs can only treat two values in a single operation. Operations involving more than two values, such as addition followed by multiplication, are usually broken down and done in successive steps. ALUs are the last component to perform operations on data in the processor; after exiting the ALU, the data is relayed back to memory. The ALU may also pass along information on the serial order of the current and subsequent operation.

Specialized types of ALUs are used in floating point units and graphics processing units. Most modern CPUs contain several ALUs, enabling the simultaneous execution of multiple arithmetic and logic operations. The ALU was first conceptualized by mathematician John von Neumann in 1945 as part of his work on EDVAC, an early computer.

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Q:
## How do you dispose of old computers?

A:Old computers are safely disposed of by wiping the hard drive and donating or recycling the unit. Using a responsible electronics recycler keeps the computer and its potentially dangerous components out of the landfill. If the computer still works, donating it to a charity is another option.

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Q:
## Explain why density is a derived unit?

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Full Answer >**Density is a derived unit because it is calculated from mass and length, which are both base units.**Density for an object or substance is defined as mass divided by volume, where volume is defined as length cubed.Filed Under: -
Q:
## Why is logic important?

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Full Answer >**Logic is important because it allows people to enhance the quality of the arguments they make and evaluate arguments constructed by others.**It is also an essential skill in academic disciplines, such as computer science and mathematics.Filed Under: -
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## What is logic?

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Full Answer >**Logic is defined in the field of philosophy as the study of valid reasoning.**It is usually further divided into three subtypes of logical reasoning: inductive reasoning, deductive reasoning and abductive reasoning.Filed Under: