ECE112 
Current Charge and Voltage Problems      

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

7. A 12V battery illuminates a light bulb for 20 minutes and then goes dead.  What 
   is the mAh rating of the battery if the light bulb consumes 100mA when on? 
   Ans: 33.3mAH