This is the "loudest" part of a guitar-the pickups and, of course, a volume knob, just in case you really wanted it to go to 11.
Actually, electric guitars are rather quiet. If you really want to make a ruckus, try playing an acoustic. (Hint: it's hollow and it resonates more. A lot more. That makes it louder.)
Now, give a man an amplifer and, my, how things change.
Until next strum...