An old potato outputs 1/3 of a volt of electricity, which is 1/3 the amount of power needed for a small lightbulb. how many potatoes would you need to power the lightbulb

In 2014, the three largest economies in the world were (listed in order, from largest): a) the u.s., china, germany. b) the u.s., china, japan. c) china, the u.s., japan. d) china, the u.s., germany.