One function of transistor most commonly used in the electronics world is as a switch. To find out how transistor as a switch, we do experiments on the following circuit.

switch transistor off condition
Switch (S1) condition in Off state or open, there is no voltage source attached to the base terminal of transistor, so that there will be no current flowing in the circuit, in other words, the lamp will not light.

switch transistor on condition
Switch (S1) condition in On state or closed, voltage source is attached to the base terminal of transistor, so that there will be currents flowing in the circuit, in other words, the lamp will turn on.

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