I don't understand this simplification question for Power

[chroncile]

Homework Statement

Given that the unit of current is related to the units of electric charge and time by A = C/s, and the unit of voltage is related to the units of energy and charge by V = J•C^-1, express the power in terms of these other units. Simplify the result further, given that the watt (W) is defined by W = J/s

Homework Equations

A = C/s
V = J•C^-1

The Attempt at a Solution

W = C/s • J•C^-1
W = J/s

Now what? I don't understand what the question is asking.

 

[PhanthomJay]

They seem to be asking that since power is voltage times current, then it has units of J/s. Since a J/s is a watt, power has units of watts. You actually have the result.