Final answer:
In a Common Collector (CC) transistor circuit, the input AC signal is typically applied between the base and emitter of the transistor, where the base voltage modulates the amplification process.
Step-by-step explanation:
In Common Collector (CC) transistor circuit configurations, the input AC signal is typically applied between the base and the emitter. The base of the transistor acts as a control gate for the flow of current between the emitter and collector.
Given that the AC voltage source fluctuates, represented by the equation V = Vo sin 2πft, where V is the instantaneous voltage, Vo is the peak voltage, and f is the frequency, the input signal is modulated in accordance with this fluctuation. As the base voltage varies with the AC input signal, it influences the current between the emitter and collector, thus amplifying the signal in the process.