1. The problem statement, all variables and given/known data What does it cost in cents to leave a 1800 Watt electric oven on for 7 hours? Assume that you pay 10 cents for every kilowatt hour which you use. 2. Relevant equations Well i dont know if im supposed to use P=E/t. i dont know how im supposed to use it 3. The attempt at a solution Do i not convert 1800 Watts to 1.8 Kilowatts, then multiply 1.8 by 7 hours..which is 12.6 then by .10 cents, which makes the answer 1.26? It is incorrect though. Thanks for your help.