Transistor as a switch

Nirmal Luhana

Prepared By : &

Shubham Thakur

A useful information about transistoris Use as a switch...

Step.1

• Take components

Step.2

• Take a breadboard..

Step.3

• Connect a 9 volt battery on the breadboard..

Step.4

• Connect a NPN transistor on a breadboard with it's 3 pin's in the 3 different holes on the breadboard...

Step.5

• Connect a emitter to the ground (negative terminal)

Step.6• Connect a LED and resistor between

collector and positive terminal of the battery.

• The LED won't glow.

Step.7

• Connect a wire between base and collector.

• The LED starts glowing.

Reasoning

• Transistor have a 3 parts base, collector and emitter..

Emitter Base Collector

• Now each and every part of the transistor have impurities.

• Collector have less impurities then base and emitter.

• Emitter have more impurities then base and collector.

• And that's why the current starts flowing from collector - base to emitter.

Example

• Now same thing with transistor. Collector have less impurities then emitter so electron will easily pass out from it.

• Emitter have more impurities then collector so electron have to face difficulty to cross it.

• As per switching work we can use transistor as a switch.