NPN vs PNP question

[jbelectric777]

I have a quick question maybe someone can answer. The difference between a PNP & an NPN transistor is one (PNP) passes positive or high with the base connected to zero and vice versa for the NPN? Is that correct. Thanks in advance, Jim

 

[bychon]

It's correct if you have the transistors configured with power supply to the left of the drwaing, emitter to the left of the transistor, base grounded, and collector to the right of the drawing.

Ps, why do you bother to make your font difficult to read instead of just leaving it alone?

 

[audioguru]

If you do not limit the base current of a transistor then it will blow up.

 

[MikeMl]

I have a quick question maybe someone can answer. The difference between a PNP & an NPN transistor is one (PNP) passes positive or high with the base connected to zero and vice versa for the NPN? Is that correct. Thanks in advance, Jim

Sort of. Here is the voltage at the collector of a NPN and a PNP as the bases are connected through a 100Ω resistor to a voltage swept from 0V to 9V. The supply voltage is fixed at 9V. Note how the two transistors are wired. Note that the NPN turns on when its base is positive with respect to its emitter, while the PNP turns on when its base is negative with respect to its emitter.

 

[crutschow]

And, as can be see from Mike ML's simulation, the normal positive to negative current flow is into the collector of an NPN and out of the collector of a PNP.