1: 25-53, energy density calculation … must do Gauss's law to get at the field along the way, moderately difficult

2 and 3:. 26-5 and 26-6, practice with current. These problems are to help you develop a feel for numbers in charge flow. These are relatively simple problems if you've had chemistry. Don't expect one like this on the exam unless it is part of another problem.

4: 26-24, Practice with potential drop across resistors and introduction to "internal resistance." This would be a simple problem if on an exam.

5: 26-32, resistive power dissipation plug and chug, simple if on exam.

6: 26-34, practice with power dissipation in electric circuit, simple if on exam.

7: 26-37 (a) and (c), practical application of power and energy flow, low-moderate difficulty

8: 26-42, example with biological/survival relevance, moderate difficulty because the problem is not in conventional setting

9: 26-68, fun with power, moderate to high difficulty