Which si unit would you use to measure the amount of juice in a glass?

Liter, or ounces. :) K12?

r=rho l/a where a is the area, l is the length and rho is resistivity so the greater the area the lesser the resistance thats why the earth pin is thicker bcos current follow the shortest path, so less resistive .

wavelength divides in half and speed stays the same.