Answer:
Joules is equivalent to power over time. Power is equivalent to volts times current, so your question does not provide enough information to answer.
To look at another way - you might ask how many joules (a measure of energy like kWh - what your electric company bills you on) are in 120 volts. If this were not dependent on current, then you would be constantly billed for every outlet in your home, regardless of whether they are in use. The fact that 120 volts is present at all outlets at all times does not mean that power is being used at all times.