question_answer 15)

You are given the two circuits as shown in Figure. Show that circuit (a) acts as OR gate while the circuit (b) acts as AND gate. (a) (b)  

Answer:

In fig. (a), and                  (Boolean algebra) Clearly fig. (a) represents an OR gate. In fig. (A),    (Using de Morgan theorem) But          and                             Y which is an AND operation. Clearly fig. (b) represents an AND gate.