Key Definitions - 2.4

Question 1

Binary

Answer 1

• Binary is used to represent all data within a computer system.
• It refers to transistors opening and closing allowing electricity to pass through or not, which is then represented using 1’s (ON) and 0’s (OFF)

Question 2

Logic Gate/Diagram

Answer 2

A way to represent Boolean operations.

Question 3

AND gate

Answer 3

Both inputs must be TRUE (on or 1) for the output to be TRUE (on or 1)

Question 4

OR gate

Answer 4

One or both inputs must be TRUE (ON or 1) for the output to be true (ON or 1)

Question 5

NOT gate

Answer 5

The output is the opposite of the input.

Question 6

Truth Tables

Answer 6

• A way we can represent a logic diagram in table form.
• It shows all the possible inputs and outputs for a logic diagram.

Question 7

/\

Answer 7

Used to represent the AND operator in a truth table or logic statement.

Question 8

\/

Answer 8

Used to represent the OR operator in a truth table or logic statement.

Question 9

¬

Answer 9

Used to represent the NOT operator in a truth table or logic statement.

Question 10

Why computers use binary -

Answer 10

• Binary is a number system that is called base 2. It used two numbers, 1 and 0, and all data is stored in these binary digits.
• Data is converted to binary via transistors. As computer systems use electrical currents (and there are no values to these) there needs to be a way of converting these currents into a form where the computer can understand what it is processing.
• As electricity passes through these transistors, they are either open (ON, TRUE, or 1) or closed (OFF, FALSE, or 0).
• The process of this electricity being passed through allows us to convert these electrical currents into 1’s and 0’s.