I have this question as a pre-lab for a physics electricity and magnetism lab. (I attached the question as an image.) I am having difficulty answering the second part: A full-wave rectified DC current is just the absolute value of the sinusoidal AC current: http://en.wikipedia.org/wiki/Image:Gratz.rectifier.en.png. I can not answer the this question because I do not know the internal workings of the multimeter. I can see three possible outcomes: 1) the multimeter is analog, it uses a galvanometer with the needle having some inertia, so the reading would be some sort of average of the maximum amplitude. 2) the multimeter is digital, and thus might measure the rms voltage. 3) the multimeter has no 'inertia', and thus would show the actual time varying voltage V(t). Any suggestions?