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IT Essentials

A+. IT Essentials. Chapter 1 Part C. 1.5 Math for a Digital Age. .5.1Measurement-related terminology. Bit – The smallest unit of data in a computer. A bit can take the value of either one or zero

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IT Essentials

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  1. A+ IT Essentials Chapter 1 Part C

  2. 1.5 Math for a Digital Age

  3. .5.1Measurement-related terminology • Bit – The smallest unit of data in a computer. A bit can take the value of either one or zero • Byte – A byte is a unit of measure used to describe the size of a data file, the amount of space on a disk or other storage medium. One byte consists of eight bits of data. • Nibble – A nibble is half a byte or four bits • Kilobyte (KB) – A kilobyte is approximately 1,000) bytes • Megabyte (MB) – A megabyte is approximately 1,000,000 bytes)

  4. Speed-related Terms • Hertz (Hz) – Is a unit of measurement of frequency. It used to describe the speed of a computer's microprocessor. • Megahertz (MHz) – One million cycles per second. This is a common measurement of the speed of a processing chip. • Gigahertz (GHz) – One billion (1,000,000,000) cycles per second. • Note: PC processors are getting faster all the time

  5. 1.5.3Boolean logic gates: AND, OR, NOT • Computers are built from various types of electronic circuits • These circuits depend on what are called AND, OR, and NOT gates • These gates are characterized by how they respond to input signals • There are only three primary logic functions: AND, OR, and NOT • OR gate acts as follows: if either input is on, the output is on. The AND gate acts as follows: if either input is off, the output is off. A NOT gate acts as follows: if the input is on, the output is off, and vice versa.

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