Final answer:
The work done on a charge q passing through a voltage difference V is W = qV, with W representing work, q representing the charge, and V the voltage difference.
Step-by-step explanation:
The amount of work that can be obtained by passing charges through a voltage difference V is given by the formula W = qV, where W stands for work, q represents the charge, and V is the voltage difference. This formula is derived from the concept that work done by an electric field on a charge is the product of the charge, the electric field strength, and the distance moved in the direction of the field, which then simplifies to the product of the charge and the voltage difference when the direction is parallel to the electric field.