ECE112 
Current Charge and Voltage Problems      

Note: The assumption is that the appliance or device operates until the last coulomb 
      is used. 

5. While watching the double feature with his gal at the drive-in theater, Sam 
   leaves the radio in his '57 Chevy on. The radio consumes 1A of current. To save 
   enough money for the movie, Sam decided not to replace his old battery which has 
   only 20,000 coulombs of charge left. Starting the car engine will require 6000 
   coulombs of charge. The double feature lasts 4 hours. 
   a)Will Sam be able to start the car after the movie? 
   b)If not, when should he have left? (answer in hours and minutes) 
   Ans: No, 0 hr 7 min ago