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20 Cards in this Set
- Front
- Back
- 3rd side (hint)
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What is computer science? |
The study of modern computing devices and how they work. |
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What has radically changed how we access the Internet? |
The invention of wireless systems like WiFi where the connection is through a router or wireless hotspot. |
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Cellular data networks |
Cellular data networks use radio cells that are hexagonal, circular or square shaped areas around radio masts. |
You don't notice these cells but your phone switches between them as you move. |
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What is a computer program? |
A sequence of instructions that enables a computer to do something. |
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Bootstrap loader |
A program that exists in a computer's memory that is automatically executed by the processor when the computer is switched on. |
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What is the purpose of an operating system? |
An operating system (OS) is software that manages computer hardware and software resources and provides common services for computer programs. It is loaded as part of the bootstrap loader as it is an essential component of the system software in a computer system. Application programs usually require an operating system to function. |
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How have computers changed since they were first introduced? |
When computers were first introduced, they were boxed connected to just a power source. Now, most devices are becoming web-enabled. Even software applications are becoming "cloud based". |
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Web-Enabled |
Connected to each other by the internet. |
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Cloud computing |
The use of linked computing resources (hardware and software) over a network, usually the internet. It is based on using remote systems containing your data, software and social media systems. |
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Open Source Software |
A program or software where the source code is available to the general public to use, and modify of they wish, free of charge. It is usually produces in collaboration and groups of users and programmers improve on the code and share the changes with anyone else. |
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Propriety Software |
Propriety software is privately owned, generally by a company. |
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Source Code |
The actual code the programmers use to write a program. It related to all programming languages. |
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PHP |
A widely used open source software called a server scripting language which is used to make websites interactive. It is at the heart of cloud computing. |
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Denary |
The base-10 counting system that humans use (0-9). |
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Binary |
A two-state counting system which is all a computer can understand. It is difficult for humans to use because it just uses 0s and 1s. |
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Why can a computer only understand binary? |
There are only two States available for a computer to detect - on and off. Electricity is either flowing or it isn't. This means that the computer can only understand instructions through a series of 0s and 1s. |
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Binary Set-Up |
Instead of each digit (bit) representing one, they are grouped into eights (a byte) and each is assigned a different value. It ranges from 128, through 64, 32, 16, 8, 4 and 2, all the way through to 1. Any number up to 256 can be shown this way. |
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Hexadecimal Digits |
0, 1, 2, 3, 4, 5, 6, 7, 8, 9, A, B, C, D, E and F. |
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Binary code for denary 67 |
128 64 32 16 8 4 2 1 X ☆ X X X X ☆☆ 01000011 |
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Denary of hexadecimal D48 |
8x16^0 = 8x1 = 8 4x16^1 = 4x16 = 64 D=13 13x16^2 = 13x256 = 3328 3328+64+8 = 3400 |
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