{ \ au }_{ L }=\\cfrac { L }{ R } =\\cfrac { 3.56 }{ 12.8 } =0.278s { i }_{ 0 }=\\cfrac { V }{ R } =\\cfrac { 3.24 }{ 12.8 } =0.253A After one time constant ( t=0.278s={\ au}_{C} ) \\quad i=\\left( 1-\\cfrac { 1 }{ e } \\right) { i }_{ 0 }=0.63{ i }_{ 0 }=0.16A Power supplied by battery =Ei P=(3.24\ imes (0.16)=0.518W