The total consumption of electrical energy in the United States is about 1.25 10^19 joules per year.

1.) What is the average rate of electrical energy consumption in watts?

2.) If the population of the United States is 313 million , what is the average rate of electrical energy consumption per person?

3.) The sun transfers energy to the earth by radiation at a rate of approximately 1.0 kW per square meter of surface. If this energy could be collected and converted to electrical energy with 41.0 percent efficiency, how great an area (in square kilometers) would be required to collect the electrical energy used by the United States ? Give your answer in square kilometers.