I don't understand this simplification question for Power

1. Sep 12, 2010

chroncile

1. The problem statement, all variables and given/known data
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

2. Relevant equations
A = C/s
V = J•C^-1

3. 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.

2. Sep 12, 2010

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.