logic gates

Question 1

what does 1 represent

Answer 1

true

Question 2

what does 0 represent

Answer 2

false

Question 3

what is a logic circuit diagram?

Answer 3

diagram made up of 2 or more connected logic gates

Question 4

what is a truth table

Answer 4

table that shows all possible combinations of inputs and, for each combination, the output that the logic gate will produce

Question 5

algebraic symbol for AND

Answer 5

.
Q = A.B or Q = A(B)

Question 6

algebraic symbol for OR

Answer 6

+
Q = A + B

Question 7

algebraic symbol for NOT

Answer 7

_
_
Q = A

Question 8

algebraic symbol for XOR

Answer 8

(+)
Q = A (+) B

Question 9

algebraic symbol for NOR

Answer 9

_____
+
____
Q = A+B

Question 10

algebraic symbol for NAND

Answer 10

______
.
___
Q = A.B

Question 11

what is the truth table for the NOT gate

Answer 11

INPUT A OUTPUT Q
0 1
1 0

Question 11

what does the NOT gate do?

Answer 11

takes a single input value and flips it to its logical opposite

Question 12

what does the AND gate do?

Answer 12

takes 2 input values and produces an output of 1if BOTH inputs are 1

Question 13

what is the truth table for the AND gate

Answer 13

INPUT A INPUT B OUTPUT Q
0 0 0
0 1 0
1 0 0
1 1 1

Question 14

what does the OR gate do?

Answer 14

takes 2 input values and produces an output or 1 if EITHER of the inputs are 1

Question 15

what is the truth table for the OR gate?

Answer 15

INPUT A INPUT B OUTPUT Q
0 0 0
0 1 1
1 0 1
1 1 1

Question 16

what does the XOR gate do?

Answer 16

takes 2 values and produces an output of 1 if EITHER BUT NOT BOTH inputs are 1
‘exclusive OR or EOR’

Question 17

what is the truth table for XOR?

Answer 17

INPUT A INPUT B OUTPUT Q
0 0 0
0 1 1
1 0 1
1 1 0

Question 18

what does the NAND gate do?

Answer 18

combines logic of AND gate and a NOT gate
opposite of AND gate

Question 19

what is the truth table for NAND?

Answer 19

INPUT A INPUT B OUTPUT Q
0 0 1
0 1 1
1 0 1
1 1 0

Question 20

what does the NOR gate do?

Answer 20

combines logic or OR gate and NOT gate
opposite of OR gate

Question 21

what is the truth table for NOR?

Answer 21

INPUT A INPUT B OUTPUT Q
0 0 1
0 1 0
1 0 0
1 1 0

Question 22

in a truth table, if there is n inputs how many combinations will there be?

Answer 22

2^n combinations

Question 23

what is a boolean expression?

Answer 23

a condition that can be TRUE or FALSE

Question 24

why do we simplify boolean algebra?

Answer 24

fewer logic gates mean simpler circuits which means cheaper designs and cheaper processors