How will a Transistor work ?
Answer:
Transistors are commonly used as electronic switches, for both high power applications including switched-mode power supplies and low power applications such as logic gates. There are two types of transistor, one is NPN and the other is PNP.
1) In a NPN transistor, applying a positive voltage from base to emitter causes the collector-to-emitter junction to short ( this is called "turning the transistor ON").
Applying a negative voltage or 0V from base to emitter causes the collector-to-emitter junction to open (this is called "turning the transistor OFF").
however...
2) In a PNP transistor, applying a negative voltage from base to emitter turns it ON. Applying a positive voltage or 0V form the base to emitter turns it OFF.
hope you understand the concepts of these transistors. It will be more clearer to you when you study further in Electronics Engineering. goodluck.
pnp or npn?
Read this
http://amasci.com/amateur/transis.html...
There are only 3 general uses of a transistor..
1. it act as a switch.
2. As an amplifier
3. As an Oscillator
Together with other components in an electronic circuit, transistors wither NPN or PNP works only as a switch, amplifier and oscillator.
Elaborate futher?
Just study Electronics & Comm. Engineering.
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