Get a brief idea of transistor and learn how to use it.
Fingertip Switching
Procedure
Connect the circuit as the picture shows
Connect it to the power supply but open circuit
A closer look
Use our fingers to switch on/off
Set up the circuit and potentiometer
Adjust the potentiometer and get some different values
Data 
Conclusion
The gain is the slope of the graph, which is about 80.
At about 0.75 mA, the transistor saturates.
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