Electricity problem set - please help and can u show step by step I don't know what im doing?

Name: 4. Calculate the power used in each of the following: a. An electronic game using a 9.0 V battery uses 0.40 A of current. 2 b. A kettle operates at 10.3 A, and has a resistance of 1 1.6 2. 2 c. A 6800 $2 cat-shaver plugged into a 120 V source. 2 5. A 4.5 kW oven operates on a 240 V household circuit. a. Calculate the current that the oven uses. 2 b. Determine the energy consumed by the oven (in megajoules) by the oven in 75 minutes. 2 c. At a rate of 2.5 */MJ, how much does this energy cost? 2