Link for Hardware Experiment:
   • BJT as a current controlled electronic switch  
BJT as a Current-Controlled Electronic Switch"
This experiment demonstrates the operation of a Bipolar Junction Transistor (BJT) as a current-controlled switch. By varying the base current, the transistor controls the collector current, enabling or disabling the LED, which acts as the load.

As the potentiometer is rotated, the current at the base of the BC107 increases or decreases.
This change in base current alters the collector current, which in turn changes the brightness of the LED.