In given below circuit transistor is used as switch for on and off bulb.So we discuss such circuits that used transistor as a switch, for an explanation of such circuits we use NPN transistor.Due to this feature, it mostly used in different electronics circuitry as a switch.The structure of a transistor is such that collector current will not flow until there is no source of current at base.As Ic=ßIb so due to zero value of base current the collector current also zero and it behave like an open switch.To open the terminals of switch we remove the current passing through the base.You can see that terminal of switch that are collector and emitter are closed and bulb is illuminating as a large collector current flowing through it.So, in this case, resultant circuit can be constructed as. In the above figure, you can see that emitter is at ground potential so we can also suppose that collector is also zero potential.
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