In this Computer Science video lecture in Hindi for class 11, 12 we explained the working of various logic gates like OR, AND, NOT, NOR, NAND, XOR and XNOR gate and also drawn their truth tables. Logic gates are digital circuits operating on electronic pulse input and output. In digital electronics absence of signal is considered as zero and presence of signal is considered as one. When we tabulate the input and output values in a table, it is known as Truth table.
OR gate : Output is 1 when there is 1 in any of the inputs.
AND gate : Output is 1 when there is 1 in both of the inputs.
NOT gate : Reverses the signal. 1 becomes 0 and 0 becomes 1.
NOR gate : It is reverse of OR gate.
NAND gate : It is reverse of AND gate.
XOR gate : Output is 1, when only of the inputs is 1.
XNOR gate : It is reverse of XOR gate.
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