Digital Electronics

 AND gate

Below figures shows demonstration of AND gate in Proteus simulation software. Here 0 volts is logic 0 and 5 volts is logic 1.

At the output of gate you can see the LED and a voltmeter. Voltmeter is just connect to see the output voltage of the circuit i.e. if it is 0 volts it is logic 0 and when it is 5 volts then it is logic 1. For logic 1 the LED glows and for logic 0 it is OFF.