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yes there is 180 phase shift. it can be seen in graphs.
Common emitter is the only transistor configuration that has an 180 degree phase difference between input and output. Common base and common collector outputs are in phase with the input.***********************************That is incorrect.The output of the common emitter is inverted, there is no phase shift.
no phase shift
180 degree phase shift
The Class A common emitter BJT design has input on the base and output on the collector. This design is inverting, or 180 degrees phase shift.
In common emitter amplifier circuit, input and output voltage are out of phase. When input voltage is increased then ib is increased, ic also increases so voltage drop across Rc is increased. However, increase in voltage across RC is in opposite sense. So, the phase difference between the input and the output voltages is 180 degrees.
The output of a common emitter stage is inverted, it is not out of phase.
An inverting amplifier is configured such that the output is 1800 out of phase with the input. that is, if a positive input increases the subsequent negative output decreases and vice versa.
The zero phase frequency is the frequency at which the phase of the input signal and the output signal match.
The amplifier whose output is inphase with it input means if we consider voltage amplification then there is zero phase shift in input and output
Input to output shorted, check active devices, transistors,fet,tubes ect....
It will depend on input & output voltage, if voltage is same current will remain same