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It can be used any where and it is preferred over PNP transistor because mobility of electron is much greater than hole.
Some applications of NPN transistors
Switching
amplification(audio amplifiers)
In manufacturing of several ICs(including 741,and TTL(74 series)).

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11y ago
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15y ago

A transistor with one layer of positively charged semiconductor material between two negatively charged layers.

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14y ago

It controls how much electric flow, travels through it.

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Q: What is meaning of npn transistor?
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