The document describes different types of logic gates - AND, OR, and NOT. It explains how each gate functions using diagrams and truth tables. The AND gate outputs high only when both inputs are high. The OR gate outputs low only when both inputs are low. The NOT gate inverts the input, outputting high for a low input and vice versa. Truth tables are provided showing the output for every combination of inputs for each gate.

1. Logic Gates

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Logic Gate AND
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Logic Gate AND
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Logic Gate AND
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Logic Gate AND
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Logic Gate AND
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Logic Gate AND
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Logic Gate AND
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Output of AND Logic Gate is High when Both
Inputs (A & B Switch )at are High (Closed).

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Logic Gate AND
From above Fig.
Switch A Switch B Bulb
OFF OFF
ON OFF
OFF ON
ON ON

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Logic Gate AND
Truth Table
Input A Input B Y=A.B
0 0 0
0 1 0
1 0 0
1 1 1
Logical Expression:
A and B = A.B =Y
A
B
Y=A.B

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Logic Gate OR
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A
B

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Logic Gate OR
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A
B

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Logic Gate OR
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B

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Logic Gate OR
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B

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Logic Gate OR
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A
B

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Logic Gate OR
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A
B

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Logic Gate OR
Output of OR Logic Gate is Low when Both Inputs
(A & B Switch ) are Low (Open).
Bulb
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A
B

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Logic Gate OR
From above Fig.
Switch A Switch B Bulb
OFF OFF
ON OFF
OFF ON
ON ON

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Logic Gate OR
Truth Table
Input A Input B Y=A.B
0 0 0
0 1 1
1 0 1
1 1 1
Logical Expression:
A Or B = A+B =Y
A
B
Y=A.B

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Logic Gate NOT
Bulb
A

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Logic Gate NOT
Bulb
A

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Logic Gate NOT
Bulb
A

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Logic Gate NOT
From above Fig.
Switch A Bulb
OFF
ON

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Logic Gate NOT
Truth Table
Input A Y=A
0 1
1 0
Logical Expression:
Y= A
A Y=A