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FSNSYou only learn by doing it yourself
From Scrap and Scratch
Experiment 1
Difference between Base and Collector Current of a Transistor
Materials Required
i. Bread Board
ii. Resistor: 330 to 1000 ohm -2
iii. 9V Transistor Battery
iv. Connecting Wire
v. NPN transistor
vi. LED - 2
Step No. 1
Take a Breadboard
Step No.2
Connect a 9V Battery on the Breadboard
Step No.3
Connect a NPN transistor on the breadboard with its 3 pins( emitter base and collector) in 3 different holes on the
breadboard
Step No.4
Connect the emitter to the ground (Negative Terminal)
Step No.5
Take two resistors and connect their one terminal to the Vcc (Positive terminal of the battery) and other terminal at two
different holes in the breadboard
Step No.6
Connect a LED between one resistor and base of transistor (middle pin). Take care in connecting positive terminal to resistor. The LED will glow but with very less brightness
Step No.7
Connect another LED between collector and the other resistor. The LED will glow more brightly than the previous one. Compare the two brightness.
Reasoning
The two LEDs glow differently because different currents are flowing across them. In a transistor, the collector current is normally 100 times the base current.
This property of transistor is extensively used and is very important while studying transistor as amplifier
Note: Here we are assuming that Beta = 100 for this transistor. What is “Beta” is not important at this level.
FSNSYou only learn by doing it yourself
From Scrap and Scratch