My question is this: what voltage must a battery have to support 10A of current trhough a light bulb with resistance 6 Ohms. Is the answer simply found by: V = R x I ---- V = 6 x 10 = 60V I believe this is correct. Part II of my question is if you kept the same battery, but added a second light bulb in series, would the original bulb's brightness increase, decrease, or stay the same. I believethat the original bulbs brightness would decrease because there is still only one source of energy, the battery, powering 2 light bulbs. Can someone tell me if im on the right track. Thank you so much!