Three resistors, $R_1$, $R_2$ and $R_3$, are connected in parallel to a cell. The currents in the resistors are $I_1$, $I_2$ and $I_3$. The potential differences across the resistors are $V_1$, $V_2$ and $V_3$. The current in the cell is $I_0$. The potential difference across the cell is $V_0$, as shown.
Which equation can be obtained by applying Kirchhoff’s second law to the circuit?
1 )
$I_0 = I_1 = I_2 = I_3$
2 )
$I_0 = I_1 + I_2 + I_3$
$V_0 = V_1 = V_2 = V_3$
4 )
$V_0 = V_1 + V_2 + V_3$
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