Yes, you have to pay attention to details! For Question 7, it shows L1 and L2. That indicates a 240vac circuit.
But your calculation is still incorrect. Let me help step you through this:
So your first calculation is E/R=I, and you used 5 ohms as the value for R.
This is a series circuit – does the current change at different points in the circuit, or is it the same at every point in the circuit?