1. There is a constant current of 9 A in a cable for 15.0 min. How much total load passes through a given point of the circuit during those 15.0 min? How many electrons would it be? If the load were 700 C, then how much current passes through the circuit for 13.3 min?

2. Calculate the lantern resistance of a 752W aircraft designed for 60V.

3. If the resistance of a car's lanterns were 7.2 , then calculate the electrical energy (in watts) if the lanterns were designed for 20 V?

4. An electric heater consumes 15.0 A constant on a 120 V line. How much energy does it require and how much does it cost per month (31 days) if it operates 3.0 h per day and the electric company charges 21.2 cents per kWh?