# CompSci Autumn 2022/23 Modern Computers Flashcards

1.1 Euclid

Mathematician who lived around 300 BC. Invented algorithms.

1.2 Algorithm

A sequence of instructions that can be followed to complete a specific task

1.3 Pingala

Mathematician who lived around 200 BC. Invented the binary number system.

1.4 Binary numbers

Numbers which consist of only 1s and 0s. Known as base-2 as there are only 2 different digits.

1.5 Converting Binary to Decimal

1.Fill the top row (right to left, starting at 1 and doubling each time you move left) 2.Fill the binary number in underneath 3.Add any columns that contain a 1.

1.6 Converting Decimal to Binary

1.Fill the top row (right to left, starting at 1 and doubling each time you move left) 2.Starting from the left, add the numbers to reach the decimal number. 3.Place a 1 in any columns that are needed.

1.7 Bitmap Images

A bitmap is a grid of binary data representing the values of pixels in an image

1.8 Pixels

Bitmap images are made up of many single points of colour. These are called pixels (short for picture elements).

1.9 Resolution

The total pixels in an image which is expressed as a calculation of the pixels as width x height.

2.1 Bit (b)

A binary digit. The smallest digit in the binary system. 0 or 1.

2.2 Byte (B)

Eight bits. Example: 01011011

2.3 Kilobyte (kB)

1000 bytes

2.4 Megabyte (MB)

1000 kilobytes

2.5 Gigabyte (GB)

1000 megabytes

2.6 Terabyte (TB)

1000 gigabytes