Question 6 10 points Save Ar A 100-watt light bulb illuminates a solar cell. The electricity from the solar cell operates a water pump that delivers 1 watt of power. What is the efficiency of the system? 100% 99% 1% 0.5% 0.1% Question 7 Batteries use a fuel cell chemical reaction nuclear reaction solar cell to produce electricity. Question 8 Which releases the most energy per gram of fuel? burning of coal nuclear fission Oburning of natural gas burning of gasoline OO