The product of charge through, and potential across, an electrical device is:
-voltage
-power
-amperage
-work

The option is Work.

The product of charge and potential is equal to the energy. Adn, as we know work is related to energy as the capacity to do work.  

Alos, because, Potential is given as, V = E/q
or E = Vq
Thus, the product of charge through, and potential across, an electrical device is:work