Assignment:
Question 1. Kilowatt-hours needed to run an electric car (95% efficiency motor) equivalent to 5 gallons of gasoline (130,000 BTU/gallon) (20 miles/gallon = 100 miles)
Question 2. Square meters of solar panel (8% efficiency) needed to provide 25 KWH/day in Michigan (sun=1380 watts/sq. meter of energy), wintertime (10 hours of light), cloudy day (30% of intensity), plus correction for angle of sunlight incidence = integral of cosine theta from 0 to 180 degrees.
Question 3. If roof is only 20 feet by 30 feet what is KWH produced.