An LED-switch network with two inputs A and B is shown. Which gate does its circuit implement?
Options

Question

An LED-switch network with two inputs A and B is shown. Which gate does its circuit implement?

G1 Physics · Accepted Answer

For the original switch-and-LED arrangement, the LED glows only when A = 0 and B = 0. The truth table 00→1, 01→0, 10→0, 11→0 equals Y = NOT(A + B), the NOR function. Final answer: Option A.