# Representing Data

• Created by: Mulla52
• Created on: 01-06-17 17:58
Why do modern computers work in binary?
This is because it is easy to represent two states in simple electronic circuits.
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What are the value of a byte, kilobyte, megabyte, gigabyte and terabyte?
8 bits = 1 byte - 1024 bytes = 1 kilobyte - 1024 kilobytes = 1 megabyte - 1024 megabytes = 1 gigabyte - 1024 gigabytes = 1 terabyte
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How are images stored on a computer?
Images are stored as binary values on a computer.
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How does the computer turn the binary values back into the image?
This is because the file with the binary data contains metadata which is essentially data about data. This includes height, width, resolution, colour (bit depth) etc.
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Define resolution.
The resolution is the number of pixels per unit. The more pixels per inch, the more data to be stored and the larger the file needed to store the image.
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What happens when you enlarge an image?
The actual image size does not change, the dots just get bigger and the image becomes pixelated/'blocky'.
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What data is stored when it comes to sound files?
Audio codec and sample rate. Sound is an analogue form so it needs to be digitally sampled to be stored on a computer.
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What is the sample interval?
This is used to describe the sample rate and is the time between samples being taken - the higher the sample interval the lower the sample rate.
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What happens when sound is sampled at a low rate?
Very few samples are taken, there is a poor match between the original sound and the sampled sound and a small file size is required.
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What happens when sound is sampled at a higher rate?
Many more samples are taken, there is good match between the original sound and the sampled sound and a large file size is required.
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What is the bit rate?
The amount of space used for each sample. A high bit rate means more accurate sampling at each point which gives better quality and more data needs to be stored which needs a larger file size.
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What is the difference between the operator and the operand?
The instruction that the CPU fetches is in two parts; the operator is the instruction part and the operand the data part.
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What is an accumulator?
A special register in the CPU used to store the results of any calculation.
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## Other cards in this set

### Card 2

#### Front

What are the value of a byte, kilobyte, megabyte, gigabyte and terabyte?

#### Back

8 bits = 1 byte - 1024 bytes = 1 kilobyte - 1024 kilobytes = 1 megabyte - 1024 megabytes = 1 gigabyte - 1024 gigabytes = 1 terabyte

### Card 3

#### Front

How are images stored on a computer?

### Card 4

#### Front

How does the computer turn the binary values back into the image?

### Card 5

#### Front

Define resolution.