AND Gate

AND gate also has two or more input signals same as that of the OR gate, and the output is single. The gate has a high output only when all the input signals are high otherwise the output signal is low. The logic symbol for the gate is shown below.

AND-GATE-FIG-3The switching circuit of the AND gate is shown below.

A lamp is connected to a voltage source through the two switches A and B. The lamp will glow when both the switches are closed. If any one of the switches is opened, the lamp will not glow.

AND-GATE-FIG-4The truth table of the AND gate is given below:

ABZ
000
010
100
111

The output of this gate will be HIGH if all the input signals are high.

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