First slide

Logic gates

Question

Figure shows a circuit designed to control a lamp. For what positions of the switches $S_{1} and S_{2}$ will the lamp be lit?

Moderate

A

closed closed
B

closed open
C

open closed
D

open open

Solution

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).

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