Base and collector current

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