In a series circuit, the current on each resistor is equal, and the sum of the voltages across each resistor is equal to the total voltage of the circuit. As we all know, the voltage on each resistor is less than the total voltage of the circuit, so the series resistors should be divided. In a parallel circuit, the voltage across each resistor is equal, and the sum of the currents across each resistor is equal to the total current (main current). As we all know, the current on each resistor is less than the total current (main current), so shunt occurs in parallel resistors. The series and parallel connection of resistors is like water flow. There is only one path for series connection. The greater the resistance, the slower the flow, the more parallel branches and the greater the current.