Problem4. A total charge of 12mC passes througha cross-sectional area of a nichrome wire in 3.1s. How many electrons pass through the cross-sectional area in 30.0s? In units of electrons. Note: What formula should I use? Assume electrical energy cost $0.080 per k*W*h, and that appliances have a potential difference across them of 113 V. Problem 16. Calculate the cost of running an electric oven that draws 26.0A of current for 24hr. In units of $. Note: How do I do this problem. Problem 17. Calculate the cost of running a television with a resistance of 27 ohms for 24hr. In units of $.