Why a class C amplifier is not used as a power amplifier?

A Class C amplifier is not used as a power amplifier because it operates with a conduction angle of less than 180 degrees, leading to significant distortion of the output signal. This results in a signal that is not suitable for audio or other high-fidelity applications, as it cannot accurately reproduce the input waveform. Additionally, Class C amplifiers are primarily used for RF applications where efficiency is critical, and the distorted output can be filtered to recover the desired signal. However, for general power amplification, Class A or Class AB amplifiers are preferred due to their linearity and lower distortion.