An inductor coil and a capacitor and a resistance of $5 \mathrm{\Omega }$ are connected in series to an a.c. source of rms voltage $30 \mathrm{V}$. When the frequency of the source is varied, a maximum r.m.s. current of $5 \mathrm{A}$ is observed. If this inductor is connected in parallel with a resistance $5 \mathrm{\Omega }$ to a battery of emf $25 \mathrm{V}$ and internal resistance $2.0 \mathrm{\Omega }$, the current drawn from the battery is