The sun transfers energy to the earth by radiation at a rate of approximately 1.00 kW per square meter of surface.
If this energy could be collected and converted to electrical energy with 24 efficiency how large an area (in square kilometers) would be required to collect the electrical energy used by the United States? ( joules per year).
If the solar collectors were arranged in a square array, what would be the length of its sides in kilometers and in miles?