Logic Gates | Boolean Algebra - OCR Computer Science A Level

Question	Answer
Why do Computers use Binary Logic?	> Can only recognise the presence or absence of current (or voltage in the case of analogue electronics) > The voltage in a computer is measured as high or low - 1 or 0 > Electronic logic gates take these inputs and produce a single output, which can be used in later gates, allowing for complex circuits
What is a NOT Gate and its Symbol?	> Inverts the input > Q = ¬A > ¬1 = 0 and visa versa Image: 180px Not Ansi Labelled.Svg (image/png)
What is an AND Gate and its Symbol?	> Outputs 1 only if both inputs are 1 > Q = A ∧ B > 1 ∧ 1 = 1 > 1 ∧ 0 = 0 > 0 ∧ 0 = 0 Image: 180px And Ansi Labelled.Svg (image/png)
What is an OR Gate and its Symbol?	> Outputs 1 only if any inputs are 1 > Q = A ∨ B > 1 ∨ 1 = 1 > 1 ∨ 0 = 1 > 0 ∨ 0 = 0 Image: 180px Or Ansi Labelled.Svg (image/png)
What is an XOR Gate and its Symbol?	> Outputs 1 only if only one input is 1 > Q = A ⊻ B > 1 ⊻ 1 = 0 > 1 ⊻ 0 = 1 > 0 ⊻ 0 = 0 Image: 180px Xor Ansi Labelled.Svg (image/png)

Resource summary

	Created by Malachy Moran-Tun over 3 years ago