OR GATE:
The OR gate performs logical addition, more commonly known as the OR function. an OR gate has two or more inputs signals with only one output signal.
In OR gate, output voltage is very high if any or all of the input voltages are high. Diodes may be used to build and OR gate.
TRUTH TABLE of OR gate
INPUT OUTPUT
a b c
0 0 0
0 1 1
1 0 1
1 1 1
where 1 is represents a high signal and 0 is represents a low signal
a and b is inputs of gate and c is a output.
1->high signal(given voltage/current)
0->low signal(not given any signal voltage/current)
AND GATE:
The AND gate performs logical multiplication,more commonly known as AND function.
the AND gate has two or more inputs and a single output. The AND gate provides high output only when all inputs are high.
TRUTH TABLE of AND gate
INPUT OUTPUT
a b c
0 0 0
0 1 0
1 0 0
1 1 1
where 1 is represents a high signal and 0 is represents a low signal
a and b is inputs of gate and c is a output.
1->high signal(given voltage/current)
0->low signal(not given any signal voltage/current)
NOT GATE OR INVERTER:
The inverter (NOT circuit)performs a basic logic function called inversion or complementation. the purpose of the inverter is to change one logic level to the opposite level. in terms of bits, it changes a 1 to a 0 and vice versa.
This gate has only one input and one output. NOT gate is called the inverter because output state is always opposite to the input state,so when the input is low signal, output signal is high and vice versa. it is called NOT gate because the output state is always opposite to that of input state.
1----->0(using NOT gate)
0----->1(using NOT gate)
 |
| fig: AND GATE,NAND GATE,OR GATE,NOR GATE and XOR GATE,XNOR GATE. . |
figures show that:
row 1: AND gate then use NOT gate it's make NAND gate.
row 2: OR gate then use NOT gate it's make NOR gate.
row 3: NOR gate then use NOT gate it's make XNOR gate.
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