A cell with electromotive force (e.m.f.) $E$ and negligible internal resistance is connected into a circuit. As shown, the circuit includes currents $I_1$, $I_2$ and $I_3$, as well as potential differences $V_1$, $V_2$ and $V_3$. Which equation states Kirchhoff's first law?
- A$I_1 = I_2 + I_3$
- B$I_1 = I_2 = I_3$
- C$E = V_1 + V_2$
- D$V_1 = V_2 = V_3$