CE amp experiment 2.

As the emitter resistor (RE) is increased by 10 ohms at a time
the dc voltage (VC) changes from a lower output voltage to a higher output voltage.
This is due to the fact that as RE gets larger in value less current flows
to RC, therefor voltage drop across RC becomes less so VC rises.

Now looking at the change in VC for every 10 ohms of change
indicated in the diagram with a "triangle VC" which means delta VC,
which means "a change in" one value with respect to another.

The amount of delta VC is around 420 mV. when RE changes from 50 to 60 ohms.
Where at 50 ohms VC=4.72 and at 60 ohms VC=5.14 so delta VC=0.42. as ((5.14-4.72)=0.42)
But as the RE value gets higher in range then the delta VC goes lower
such as when RE is changed from 130 ohms to 140 ohms (6.61-6.51)=100mV.

Conclusion:
As RE value is higher in range, then a 10 ohm change in RE will result in a smaller
delta VC, with respect to when RE is lower value and then changed by 10 ohms,
which gives a much larger delta VC.

This is assuming that all bias resistors remain the same value (except RE) through out the test.

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