experiment 8

Vary base resistor and measure the changes in voltage and current for vce,vbe, ic & ib.

I chose 5 different value resistors as shown in diagram on the left.                                                 What happened to the vce during this experiment was there is more current flow through due to bigger resistors.                                                   What happened to vbe during same experiment was only a small vd due to different size resistors.        What happened to Ib was that the current flow changed due to the different size resistors being used in the circuit.                                                       What happened to Ic the voltage rose as the gate was opened up because the flow through Ib was greater.     

Calculating the BETA (Hfe) of this transistor using the above graph.the Ratio between Collector over Base.......   

(1) 3.1 / 5 mA

(2) 5 / 4.37 mA

(3) 5 / 1 mA

(4) 104 / 21.7 mA

(5) 5.1 / 4.5 mA

Explaination of the line graph and what it is telling me.

The saturated region on the graph is the ideal place to be showing that the transistor is using minimal voltage but is creating high amps.

The active region is where you would expect a good working transistor to be, it functions using high voltage and still has the good amperage flow.

The cut off region is where the transistor isn't working well, its using using high voltage and is preventing amps from flowing through.