A triangular array of resistors is shown in $\textbf{Fig. E26.5}$. What current will this array draw from a 35.0-V battery having negligible internal resistance if we connect it across (a) $ab$; (b) $bc$;
(c) $ac$? (d) If the battery has an internal resistance of 3.00 $\Omega$, what current will the array draw if the battery is connected across $bc$?