Define NAND and NOR gates. Give their truth tables.

Explanation

NAND gate `:` NAND gate is a combination and AND gate and NOT gate.

NAND gate can be obtained by connecting a NOT gate in the output of an AND gate. NAND gates are called universal gates.
(i) If both inputs are low, output is high.
`A=0,B = 0 , X= 1 `
(ii) If any input is low, output is high.
`A= 0 , B = 1 , X =1 `
`A = 1, B = 0 , X = 1 `
(iii) If both inputs are high, output is low
`A = 1 , B =1 , X = 0`

NOR gate `:` NOR gate is a combination of OR gate and NOT gate when the output of OR gate is connected to NOT gate.If has two ( or ) more inputs and one output.

(i) If both inputs are low, output is high
A=0,B= 0 , X=1
(ii) If any input is high , the output is low,
A=0,B=1,X=0
A=1,B=0,X=0
(iii) If both inputs are high, the output is low,
A =1,B=1,X=0
NOR gate is also a universal gate.