question_answer

In the circuits shown in Fig. a switch which is open represents the logic state 0 and the switch which is closed represents the logic state 1. The lamp L is lit when output is logic state 1. What types of gate are represented by the circuits in (a) and (b)? 

Answer:

                    (i) The circuit in Fig. (a) represents an AND gate because the lamp L will glow only when both the switches A AND B are closed. (ii) The circuit in Fig. (b) represents an OR gate because the lamp L will glow when switch A or switch B or both switches are closed.