1. Eight 7 W Christmas tree lights are connected in series to each other and to a 120 V power source. What is the resistance of each light bulb?
2. A person leaves his car with the lights on. There are two headlights and 40 W each and two taillights of 8 W each, all connected in parallel to each other and in series with the car battery. Precisely measuring the battery gives 12.6 V and the battery capacity is 85 A·h. How long would the battery of this car last?
Hint: In both problems use the stated power to determine the current consumption.
