How does an audio amplifier work?

well u plug your thing into the wire in comes with and there should be a plug on the side!

Jim se poochh le, aur jawab bhi le le........

It makes the sounds louder So it amplifies (increases in size/volume/sound) of the audio

It will if you have proffessioanal equipment to go with it ( speakers ) the amp has to be around the same wattage of the speaker or you will get distortion.

Mainly by shorting out, letting the + and - wires or connectors touch. Even for a split second this can do a world of damage. Some of the larger amps have fuses in the speaker line to help avoid this...