Let's say that in your dorm room you have a 100W ceiling light, a 40W desk light, and that your computer uses 45W. The day before an exam, you pull an all-nighter and keep your ceiling light, desk light, and computer on for 12 hours non-stop. In addition, you had to make coffee and your 1000W coffeemaker was on for 15 minutes.

(a) How much electrical energy (in kWh) did you consume in preparation for this exam?

(b) Approximately, how much energy did it take during this 12h exam preparation to keep the entropy in your body at a constant level? (let's say that your food intake in the days leading up to the exam was a constant 2,000Cal/day, i.e. 2,000 food-calories = 2,000,000 cal.)