Experiment No.8 - Transistor Voltage drop

In this experiment we where to create a circuit and vary the base resistor and measure changes in voltage and current for Vce, Vbe, Ic and Ib. Then plot a load line.

I used a 470R for Rc and a BC547 NPN transistor

these are the reading I found

Vce is the voltade between the collector and emitter, You can see in the table as the Rb increases the Vce also increases. This shows that wih a higher resistor and less voltage getting to the base there is going to be a greater voltage drop.

The vbe is the voltage between the base and the emitter, as shown in the table there is very little change between the vbe . This is becasue the transistor only requires 0.7v to operate.

the higher the Rb the lower the Lb is going to be,this is because there is such a large resistance there is going to be less current at the base.

The Ic was lower as the resistance increased. The greater the Ic the more the transistor is on which is increased current flow.

Here is the graph which i plotted the table onto.

Beta = Vce at 1.25v = 5.9mA and 70MA

B = 0.0059 / 0.000070 = 84.2

The load line on the graph is showing the relationship of Ic and Vce. This load line on this graph is showing the transistor is saturated at 8.27mA at .7 volts and cuts off at 113.9MA.