Experiment No. 8

I have created the following circuit which is 470R for RC and BC457 NPN Transistor.

I have picked five resistors between 2K2 and 1M for Rb. I have have placed these resistors to see when Vce is saturated switch region and when it is in the active amplifier region. I have also used other different types of resistors to measure and record voltage drop across Vce and Vbe. Also measure and record the current for Ic and Ib, then i have changed the Rb resistor and did all the measurement and recorded the new reading. The output of my measurements are illustrated in the following table:

Rb	2.2K W	Vbe	0.78V	Vce	0.04V	Ib	1.91mA	Ic	6.09mA
Rb	55K W	Vbe	0.73V	Vce	0.10V	Ib	0.1mA	Ic	0.61mA
Rb	220K W	Vbe	0.60V	Vce	3.27V	Ib	2.3mA	Ic	7.7mA
Rb	270K W	Vbe	0.70V	Vce	1.13V	Ib	0.05mA	Ic	4.7mA
Rb	1M W	Vbe	0.67V	Vce	2.85	Ib	0.11mA	Ic	1.1mA

During this experiment voltage dropped between collector and emitter, the bigger the resistor the high voltage drop reading between Vce and the smaller the resistor was the less voltage drop was between C and E.

During this experiment for Vbe there was a slightly voltage drop in Vbe but not a major change.

In my experiment in Ib the current flow was dropping and in increasing.

Resistance Rb: It resistricts the current flow along Ib, so bigger the resistance the less the current flow to the base.

During Ic experiment it was the same as above as we placed a bigger resistance in Rb, it resistricted the current flow to the collector.

Load line represents Ic again Vce, the higher current flow to Ic, the lower voltage drop (Vce) or wise-versa. Transistor is fully opened in saturated area so it means more current flow in active area, the transistor is active in active area (Increase and Decrease) the flow of the current depends on the resistance (Rb) in cut off area more voltage drop, more heat generated and less current flow, further voltage drop and more heat generated would damage the transistor. for instance, increase the current flow from base to emitter will increase the current flow from collector to emitter