Currents in a Parallel Circuit
A cell is connected to two resistors in parallel.
This means that a wire from one pole of the cell is joined to two wires. Each of these two wires are joined to a resistor. The wires from the other end of the resistors are joined to a single wire which goes to the other pole of the cell.
So when current flows from cell, it splits up into two parts. Each part goes through one resistor. The two parts leaving the resistors join together again and return to the cell.
The sum of currents in the two resistors is equal to the current from the cell.
The reason is that the total charge does not change. For example, suppose that 0.3 A of current flows from the battery. This splits into 0.1 A going to one resistor and 0.2 A to the other resistor. Every second, 0.3 C of charge flow from the battery. 0.1 C goes to one resistor, and 0.2 C goes to the other one. So every second, the total charge through the resistors is the same as the charge from the cell.
When the two separate currents from the resistors recombine and go into one wire again, the current is also equal to the sum of the separate currents. So the 0.1 A and 0.2 A would join to give 0.3 A.