Revision Y9 Flashcards
Who was Charles Babbage?
Charles Babbage, known as the Godfather of Computing, was born in 1791 and died in 1871, and he is best of all known for designing the first automatic computing machine, which was to remove human error entirely.
What was Charles Babbage Famous For?
He had designed a steam powered calculating device called the ‘Difference Engine’, and was perfectly accurate, meaning no room for human error. The man himself was an amazing problem solver, and used logical thinking to be able to work out the steps need to to be able to get a machine to make a calculation to an exact number.
What is Logical Thought?
Logical Thinking is when you apply the rules of one related statement or fact to another one. This is what Charles Babbage did.
How is Logical Thought important for Problem Solving?
Logical Thought is important for Problem Solving because it provides you a systematic way of going about the problem and then hopefully solving it.
Why is it important to be clear when describing Problem Solving?
It is very, very important to be clear when you are describing Problem Solving, as sometimes it can be very complicated and therefore, needs to be laid out in the right way.
Who was George Boole?
George Boole was a Mathematician in the 1800’s and he is best known for leading us to realise that computers could act and behave like humans, in his theory known as ‘Boolean Logic’. This new concept was a big advancement in the technological world.
What was George Boole Famous for?
George Boole realised that ‘human though is mastered by laws, which can be described by means of mathematics’, which then led people on to realising that computers were simply calculating devices. This is extremely important because this new way of thinking led onto the development and understanding of CPU’s and Logic Gates. This is what he was famous for.
What are the three Logic Gates and what do they do?
There three Logic Gates are the:
- NOT Gate
- AND Gate
- OR Gate
How to Solve the three Logic Gates?
-NOT
Do the opposite
-AND
Every combination is 0, except for both 1’s being one
-OR
Every combination is 1, except for both 0’s being zero
Who was Alan Turing?
This man is Alan Turing, and he was one of the first ever computer scientists, as well as a mathematician, who was able to decipher coded messages from the Enigma that were sent by the Germans in the World War.
What was Alan Turing Famous For?
He was famous for being able to make a machine which would help crack the German Enigma code. He did this by using the Bombe machine which he invented, which reduced the amount of possibilities of what could be written, meaning that the British could try and work out the code easier.
How do PigPen Ciphers work?
The PigPen Ciphers work by using certain symbols that correspond to a table to give you the code.
How do Caesar Ciphers work?
The Caesar Cipher works by using the letter in the alphabet that is 3 letter behind the word that is in the code.
What does Encryption mean?
In the dictionary, Encryption means: “the process of converting information or data into a code, especially to prevent unauthorized access.”
Who was Tim Berners-Lee?
Sir Tim Berners-Lee was born on the 8th of June in 1955 and grew up in London. Later on in his life, he studied physics at Oxford University and decided to become a software engineer.
