What is 1.5v?
A very stupid person. The only use for their brain is to stick a copper nail in one end, a zinc nail in the other, and you might get 1.5 volts by using their brain as a battery. Works well if they eat plenty of salty foods.
(1) This whole classroom yields no more than 6 volts.
(2) I'd say he's a half-volt. Maybe less.