The emitter-base junction of both the NPN and PNP transistor is connected in forward biased.The switching time of NPN transistor is more as compared to PNP transistor because the majority charge carrier of NPN transistor is an electron.The minority charge carrier of the NPN transistor is the hole and in PNP transistor it is electrons.In NPN transistor, the majority charge carrier is electron whereas in PNP transistor the majority hole is the majority charge carrier.In NPN transistor the output current exists because flows of the holes and in PNP it is constituted because of the flows of the electrons.The inside current in NPN transistor constitutes because of the varying position of the electrons whereas in PNP transistor the inside current is because of the varying position of the holes.The NPN transistor turn-on when the electron enters into the base while the PNP transistor is turned on when holes enter into the base.In NPN transistor, the current flow from collector to emitter because positive supply is given to the base, whereas, in PNP transistor the current flows from the emitter to the collector.In NPN transistor the head of the arrow move outward to the base and in PNP the arrow moves inward.
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