what does a power amplifier amplify, current, voltage, or both?

what does a power amplifier amplify, current, voltage, or both?

A power amplifier amplifies voltage. Its primary function is to take an input signal, typically a low-level voltage signal, and increase the amplitude (voltage) of that signal to a level that can drive a load, such as speakers or headphones, with sufficient power. This amplified voltage signal is what powers the transducers (speakers or headphones) …

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