OR Gate using Transistors on a Breadboard
This circuit shows the working of a logical OR Gate. When both the switches are open, there is no current flowing through the transistors and hence the output is LOW. In this state, the LED is OFF. When either or both the switches are closed, the current flows through the respective transistors to the LED. This causes the output to go HIGH.

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NOR Gate using Transistors on a Breadboard

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