Question

why is nor called a universal gate with diagram

Answer 1

Hey !!

Question

           Why is NOR gate called a universal gate with diagram ?

Answer

          NOR gate is also called universal gate because it can also perform all the three functions of an OR gate , AND gate and NOT gate. It is as explained below :

1. OR gate :- OR gate can be realized by connecting the output of a NOR gate to an inverter. The output of NOR gate is A + B(bar) which is inverted to give Y = A + B, the logic function of a normal OR gate.

2. AND gate :- The use of two inverters and a NOR gate. To get an AND gate.

Here, two inverters have been used, one for each input. The inverted input A(bar) and B(bar) have been applied to the NOR gate. The output of NOR gate :-

              A + B(bar) = A.B

3. NOT gate :- If the two inputs of NOR gate are tied together. The output is A(bar) + A(bar). By De Morgan's Theorem A(bar) + A(bar) = A(bar)

GOOD LUCK !!