Why CE configuration has an iverting output

Why we obtain inverting signal (180 out of phase ) in CE configuration

Your Answer

As in ce configuration base current is directly proportional to base voltage and it also increases the collector current which create a voltage drop in the resistor across the collector as the output is situated below the collector resistance the output voltage thus decreases as the voltage drop across the collector resistor increases .thus produces a phase shift of 180 degrees
and we can verify this by kirchoff's law,Vcc=Icc+Vout .here when collector current increases output voltage must decrease.

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