Logic gate

 Ordinary algebra

Addition,substraction, multiplication, are basic operator in ordinary algebra.

0,1,2,3,4,5,6,7,8,9 ten digits are used known as decimal system.

Boolean algebra

OR,AND,NOT,  basic operator in Boolean algebra.

Binary digits are used (0,1) known as binary system.

Analong circuit

A current or voltage which varies continuously with time is called analog signal.

The electronic circuit which process analong circuit.

 Exp- Ammeter, voltmeter, Galvanometer.

Digital circuit

A current or voltage which does not vary continuously with time.only gives two discreate values high or low is called digital signal. The high value is denoted as 0.

The electronic circuit which process digital signal is called digital circuit.

Exp- digital multimeter, digital clock, morden computer,pocket calculator.

OR gate

It is realised by using two junction diodes.

It has two or more inputs but one output.

It is expressed as y=A+B=A OR B(reads as Y equuals A OR B.