Questions
Figure shows a circuit designed to control a lamp. For what positions of the switches will the lamp be lit?
a
closed closed
b
closed open
c
open closed
d
open open
detailed solution
Correct option is D
When output of NAND gate is low (i.e. 0), then current will flow through bulb to lit it up. This will happen when both switches are open. In this case +5V (or high logic) will appear at input of NAND gate and so its output will be low (i.e. 0).Talk to our academic expert!
Similar Questions
In the following circuit, the output Y for all possible inputs A and B is expressed by the truth table
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